That's a very nice build, but I personally am not crazy about relying on Shadow Meld to hit the cap. I'd do something like this (pretty much based on my BS/Shield scrapper):
Villain Plan by Mids' Villain Designer 1.962
http://www.cohplanner.com/
Waldrada Jr.: Level 50 Natural Stalker
Primary Power Set: Broad Sword
Secondary Power Set: Shield Defense
Power Pool: Leaping
Power Pool: Fighting
Power Pool: Speed
Power Pool: Concealment
Ancillary Pool: Blaze Mastery
Villain Profile:
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Level 1: Hack Hct-Dmg(A), Hct-Dmg/Rchg(3), Hct-Acc/Dmg/Rchg(3), Hct-Dam%(5), Hct-Dmg/EndRdx(5), Mk'Bit-Acc/EndRdx/Rchg(7)
Level 1: Hide LucoftheG-Rchg+(A), ShlWal-ResDam/Re TP(37), LucoftheG-Def(40)
Level 2: Deflection Rct-Def(A), Rct-Def/EndRdx(7), Rct-EndRdx/Rchg(9), Rct-Def/Rchg(9), Rct-Def/EndRdx/Rchg(11), Rct-ResDam%(11)
Level 4: Combat Jumping DefBuff-I(A), LucoftheG-Rchg+(42), BlsoftheZ-Travel(43), BlsoftheZ-Travel/EndRdx(46), BlsoftheZ-ResKB(46)
Level 6: Battle Agility RedFrt-Def/EndRdx(A), RedFrt-Def/Rchg(13), RedFrt-EndRdx/Rchg(13), RedFrt-Def/EndRdx/Rchg(15), RedFrt-Def(15), RedFrt-EndRdx(17)
Level 8: Assassin's Slash SprStlGl-Acc/Dmg(A), SprStlGl-Dmg/Rchg(19), SprStlGl-Acc/Dmg/Rchg(21), SprStlGl-Dmg/EndRdx/Rchg(21), SprStlGl-Acc/Dmg/EndRdx/Rchg(23), SprStlGl-Rchg/Hide%(23)
Level 10: Build Up RechRdx-I(A)
Level 12: True Grit GldArm-3defTpProc(A), StdPrt-ResDam/Def+(17), Prv-Absorb%(19), Prv-Heal(46)
Level 14: Placate RechRdx-I(A)
Level 16: Active Defense RechRdx-I(A)
Level 18: Parry LucoftheG-Rchg+(A)
Level 20: Against All Odds EndRdx-I(A)
Level 22: Boxing Acc-I(A)
Level 24: Hasten RechRdx-I(A), RechRdx-I(25), RechRdx-I(25)
Level 26: Disembowel SprAssMar-Acc/Dmg(A), SprAssMar-Dmg/Rchg(27), SprAssMar-Acc/Dmg/Rchg(27), SprAssMar-Dmg/EndRdx/Rchg(29), SprAssMar-Acc/Dmg/EndRdx/Rchg(29), SprAssMar-Rchg/Rchg Build Up(31)
Level 28: Grant Cover LucoftheG-Rchg+(A)
Level 30: Tough UnbGrd-ResDam/EndRdx(A), UnbGrd-Rchg/ResDam(31), UnbGrd-ResDam/EndRdx/Rchg(31), UnbGrd-ResDam(33)
Level 32: Head Splitter Arm-Dmg(A), Arm-Dmg/Rchg(33), Arm-Acc/Dmg/Rchg(33), Arm-Acc/Rchg(34), Arm-Dmg/EndRdx(34), TchofLadG-Rchg/EndRdx(34)
Level 35: Shield Charge Obl-Dmg(A), Obl-Acc/Rchg(36), Obl-Dmg/Rchg(36), Obl-Acc/Dmg/Rchg(36), Obl-Acc/Dmg/EndRdx/Rchg(37), Obl-%Dam(37)
Level 38: Weave RedFrt-Def/EndRdx(A), RedFrt-Def/Rchg(39), RedFrt-EndRdx/Rchg(39), RedFrt-Def/EndRdx/Rchg(39), RedFrt-Def(40), RedFrt-EndRdx(40)
Level 41: Stealth DefBuff-I(A), LucoftheG-Rchg+(42)
Level 44: Char BslGaz-Acc/Hold(A), BslGaz-Acc/Rchg(45), BslGaz-Rchg/Hold(45), BslGaz-EndRdx/Rchg/Hold(45)
Level 47: Fire Blast Apc-Dmg(A), Apc-Dmg/Rchg(48), Apc-Acc/Dmg/Rchg(48), Apc-Acc/Rchg(48), Apc-Dmg/EndRdx(50)
Level 49: Super Speed BlsoftheZ-Travel(A), BlsoftheZ-Travel/EndRdx(50), BlsoftheZ-ResKB(50)
Level 1: Assassination
Level 1: Brawl Empty(A)
Level 1: Prestige Power Dash Empty(A)
Level 1: Prestige Power Slide Empty(A)
Level 1: Prestige Power Quick Empty(A)
Level 1: Prestige Power Rush Empty(A)
Level 1: Prestige Power Surge Empty(A)
Level 1: Sprint Empty(A)
Level 2: Rest Empty(A)
Level 4: Ninja Run
Level 2: Swift Empty(A)
Level 2: Health Mrc-Rcvry+(A), NmnCnv-Regen/Rcvry+(43)
Level 2: Hurdle Empty(A)
Level 2: Stamina PrfShf-EndMod(A), PrfShf-End%(42), EndMod-I(43)
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The ideal Broadsword attack chain is Headsplitter -> Headsplitter -> Headsplitter.
Failing that, for a scrapper you want Hack->Disembowel->Headsplitter. For a Stalker however, with the addition of Assassin's Slash, you might ironically be better served with Hack->AS->Headsplitter and ignore Disembowel, but also depends on proc placement and whether you want to ignore the utility of Disembowel's Knockdown. Note that I haven't really paid much attention to damage proc placement in my build, so a bit of a tweak there is probably in order.
Also note that Reactive Defenses is the best set you can slot on a defense power, because a 6-slot will give you 12.5 Haste and a global scaling damage resistance that starts at 3%. Can't go wrong with either of those!
And enhancement converters make getting that Shield Wall and Gladiator's Armor super easy since PvP drops now happen in PvE too. Literally any PvP IO will work fine since there's no other bonuses, so you don't care about level.