While Agility is definitely a great choice for /cold, Musculature is always going to be strictly superior as long as you can achieve your build goals without relying on Alpha. The main reason for that is the fact that it not only buffs your own damage output, but also that of your Judgement and Lore abilities.
Here's my currently planned build for my ice/cold corr. It has softcapped S/L/E and Ranged as well as generally higher stats across the board than those of the OP's build. Recharge is 10% lower, but due to more optimized slotting some powers actually have shorter coodowns. Heat Loss has 90% uptime so endurance should never be an issue. Now this build could still use some fine tuning, for exapmple Rectified Reticle bonus in Aim isn't really needed and I should probably use that slot for an extra acc in Benumb, but my OCD won't let me to go to 49.9% to S/L. Also, I'm not sure how the new procs work in rain type powers, so I chose to ignore them for now. Either way, this build should be decent enough to use as a baseline.
Hero Plan by Mids' Hero Designer 1.962
http://www.cohplanner.com/
Click this DataLink to open the build!
Breen: Level 50 Magic Corruptor
Primary Power Set: Ice Blast
Secondary Power Set: Cold Domination
Power Pool: Flight
Power Pool: Speed
Power Pool: Fighting
Power Pool: Leadership
Ancillary Pool: Mace Mastery
Hero Profile:
Level 1: Ice Blast
(A) Thunderstrike - Accuracy/Damage/Endurance
(3) Thunderstrike - Damage/Endurance/Recharge
(3) Thunderstrike - Accuracy/Damage
(5) Thunderstrike - Damage/Endurance
(5) Thunderstrike - Damage/Recharge
(7) Thunderstrike - Accuracy/Damage/Recharge
Level 1: Infrigidate
(A) Achilles' Heel - Chance for Res Debuff Level 2: Ice Shield
(A) Luck of the Gambler - Recharge Speed Level 4: Fly
(A) Blessing of the Zephyr - Run Speed, Jump, Flight Speed, Range
(13) Blessing of the Zephyr - Run Speed, Jump, Flight Speed, Range/Endurance
Level 6: Hasten
(A) Recharge Reduction IO
(7) Recharge Reduction IO
Level 8: Freeze Ray
(A) Superior Scourging Blast - Accuracy/Damage
(9) Superior Scourging Blast - RechargeTime/PBAoE +End
(9) Superior Scourging Blast - Accuracy/Damage/Endurance/RechargeTime
(11) Gladiator's Javelin - Damage/Endurance/Recharge
(11) Gladiator's Javelin - Chance of Damage(Toxic)
(48) Apocalypse - Chance of Damage(Negative)
Level 10: Glacial Shield
(A) Luck of the Gambler - Recharge Speed Level 12: Ice Storm
(A) Superior Scourging Blast - Accuracy/Damage/RechargeTime
(13) Superior Scourging Blast - Damage/RechargeTime
(15) Superior Scourging Blast - Damage/Endurance/RechargeTime
(15) Positron's Blast - Damage/Recharge
Level 14: Boxing
(A) Empty Level 16: Frostwork
(A) Preventive Medicine - Chance for +Absorb
(19) Preventive Medicine - Heal/RechargeTime
(19) Preventive Medicine - Endurance/RechargeTime
(21) Preventive Medicine - Heal/Endurance
(21) Preventive Medicine - Heal
(23) Preventive Medicine - Heal/RechargeTime/Endurance
Level 18: Bitter Ice Blast
(A) Superior Malice of the Corruptor - Damage/Recharge
(23) Superior Malice of the Corruptor - Accuracy/Damage/Recharge
(25) Superior Malice of the Corruptor - Damage/Endurance/Recharge
(25) Superior Malice of the Corruptor - Accuracy/Damage
(27) Superior Malice of the Corruptor - Recharge/Chance for Negative Energy Damage
(27) Superior Malice of the Corruptor - Accuracy/Damage/Endurance/Recharge
Level 20: Arctic Fog
(A) Red Fortune - Endurance/Recharge
(33) Red Fortune - Endurance
(34) Red Fortune - Defense/Endurance
(34) Red Fortune - Defense/Recharge
(34) Red Fortune - Defense
(36) Red Fortune - Defense/Endurance/Recharge
Level 22: Tough
(A) Gladiator's Armor - TP Protection +3% Def (All)
(31) Gladiator's Armor - Resistance
(31) Gladiator's Armor - Recharge/Endurance
(33) Steadfast Protection - Resistance/+Def 3%
Level 24: Maneuvers
(A) Red Fortune - Defense
(29) Red Fortune - Defense/Endurance
(29) Red Fortune - Endurance
(31) Red Fortune - Defense/Recharge
(43) Red Fortune - Endurance/Recharge
(43) Red Fortune - Defense/Endurance/Recharge
Level 26: Bitter Freeze Ray
(A) Thunderstrike - Accuracy/Damage/Endurance
(36) Thunderstrike - Damage/Endurance/Recharge
(36) Thunderstrike - Accuracy/Damage
(37) Thunderstrike - Damage/Endurance
(37) Thunderstrike - Damage/Recharge
(37) Thunderstrike - Accuracy/Damage/Recharge
Level 28: Benumb
(A) Recharge Reduction IO
(40) Recharge Reduction IO
Level 30: Hover
(A) Blessing of the Zephyr - Run Speed, Jump, Flight Speed, Range
(33) Blessing of the Zephyr - Run Speed, Jump, Flight Speed, Range/Endurance
(45) Luck of the Gambler - Recharge Speed
Level 32: Blizzard
(A) Ragnarok - Damage/Endurance
(46) Ragnarok - Chance for Knockdown
(46) Ragnarok - Damage/Recharge
(46) Ragnarok - Accuracy/Damage/Recharge
(50) Ragnarok - Accuracy/Recharge
Level 35: Sleet
(A) Recharge Reduction IO
(50) Recharge Reduction IO
Level 38: Heat Loss
(A) Efficacy Adaptor - EndMod/Accuracy/Recharge
(39) Efficacy Adaptor - Accuracy/Recharge
(39) Efficacy Adaptor - EndMod/Recharge
(39) Efficacy Adaptor - EndMod
(40) Efficacy Adaptor - EndMod/Endurance
(40) Efficacy Adaptor - EndMod/Accuracy
Level 41: Weave
(A) Reactive Defenses - Scaling Resist Damage
(42) Reactive Defenses - Defense
(42) Reactive Defenses - Defense/Endurance/RechargeTime
(42) Reactive Defenses - Defense/Endurance
(43) Reactive Defenses - Endurance/RechargeTime
(50) Reactive Defenses - Defense/RechargeTime
Level 44: Scorpion Shield
(A) Luck of the Gambler - Recharge Speed
(45) Shield Wall - Defense/Endurance
(45) Shield Wall - Defense
(48) Shield Wall - +Res (Teleportation), +5% Res (All)
Level 47: Aim
(A) Rectified Reticle - Increased Perception
(48) Rectified Reticle - To Hit Buff/Recharge
Level 49: Afterburner
(A) Luck of the Gambler - Recharge Speed Level 1: Brawl
(A) Empty Level 1: Prestige Power Dash
(A) Empty Level 1: Prestige Power Slide
(A) Empty Level 1: Prestige Power Quick
(A) Empty Level 1: Prestige Power Rush
(A) Empty Level 1: Prestige Power Surge
(A) Empty Level 1: Scourge
Level 1: Sprint
(A) Empty Level 2: Rest
(A) Empty Level 4: Ninja Run
Level 2: Swift
(A) Flight Speed IO Level 2: Health
(A) Miracle - +Recovery Level 2: Hurdle
(A) Empty Level 2: Stamina
(A) Performance Shifter - EndMod
(17) Performance Shifter - Chance for +End
(17) Endurance Modification IO
Level 50: Musculature Core Paragon
Level 0: Portal Jockey
Level 0: The Atlas Medallion
Level 0: Task Force Commander
Level 0: Freedom Phalanx Reserve
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