Here's my Rad/StJ if you want some more ideas. She's not softcapped to defense, but I've found that between all her resists, Particle Shielding, and Barrier, she really didn't need it:
Hero Plan by Mids' Reborn : Hero Designer 2.6.0.7 https://github.com/ImaginaryDevelopment/imaginary-hero-designer
Click this DataLink to open the build!
Agent Trinity: Level 50 Science Tanker Primary Power Set: Radiation Armor Secondary Power Set: Street Justice Power Pool: Leaping Power Pool: Speed Power Pool: Fighting Power Pool: Leadership
Hero Profile: Level 1: Alpha Barrier -- RctArm-ResDam(A), RctArm-EndRdx(3), RctArm-ResDam/EndRdx(3), RctArm-ResDam/EndRdx/Rchg(5) Level 1: Initial Strike -- KntCmb-Acc/Dmg(A), KntCmb-Dmg/EndRdx(5), KntCmb-Dmg/Rchg(7), KntCmb-Dmg/EndRdx/Rchg(7) Level 2: Heavy Blow -- SprMghoft-Acc/Dmg(A), SprMghoft-Dmg/Rchg(9), SprMghoft-Acc/Dmg/Rchg(9), SprMghoft-Dmg/EndRdx/Rchg(11), SprMghoft-Acc/Dmg/EndRdx/Rchg(11), SprMghoft-Rchg/Res%(13) Level 4: Proton Armor -- RctArm-ResDam(A), RctArm-EndRdx(17), RctArm-ResDam/EndRdx(19), RctArm-ResDam/EndRdx/Rchg(19) Level 6: Fallout Shelter -- StdPrt-ResDam/EndRdx(A), StdPrt-ResDam/Def+(21), GldArm-3defTpProc(21) Level 8: Super Jump -- Empty(A) Level 10: Radiation Therapy -- NmnCnv-Heal/EndRdx(A), NmnCnv-Heal/Rchg(23), NmnCnv-Heal/EndRdx/Rchg(23) Level 12: Beta Decay -- ShlBrk-%Dam(A), AchHee-ResDeb%(25), ShlBrk-DefDeb/EndRdx/Rchg(25), ShlBrk-Acc/DefDeb(27), ShlBrk-Acc/EndRdx/Rchg(27) Level 14: Gamma Boost -- NmnCnv-Heal/EndRdx(A), NmnCnv-Heal(29), NmnCnv-Heal/Rchg(29) Level 16: Combat Readiness -- RctRtc-ToHit(A), RctRtc-ToHit/Rchg(31), RechRdx-I(50) Level 18: Particle Shielding -- NmnCnv-Heal/EndRdx(A), NmnCnv-Heal/Rchg(31), NmnCnv-Heal/EndRdx/Rchg(31) Level 20: Rib Cracker -- SprGntFis-Acc/Dmg(A), SprGntFis-Dmg/Rchg(33), SprGntFis-Acc/Dmg/Rchg(33), SprGntFis-Dmg/EndRdx/Rchg(33), SprGntFis-Acc/Dmg/EndRdx/Rchg(34), SprGntFis-Rchg/+Absorb(34) Level 22: Taunt -- PrfZng-Dam%(A) Level 24: Hasten -- RechRdx-I(A), RechRdx-I(34) Level 26: Ground Zero -- Erd-Acc/Rchg(A), Erd-Acc/Dmg/Rchg(36), Erd-Acc/Dmg/EndRdx/Rchg(36), Erd-Dmg(36), ScrDrv-Acc/Dmg/EndRdx(37), AchHee-ResDeb%(37) Level 28: Spinning Strike -- Rgn-Dmg(A), Rgn-Dmg/Rchg(37), Rgn-Acc/Dmg/Rchg(39), Rgn-Acc/Rchg(39), Rgn-Dmg/EndRdx(39) Level 30: Combat Jumping -- LucoftheG-Def/Rchg+(A), Ksm-ToHit+(40), ShlWal-ResDam/Re TP(40) Level 32: Meltdown -- Ags-ResDam/Rchg(A), TtnCtn-ResDam/Rchg(40) Level 35: Shin Breaker -- SprBlsCol-Acc/Dmg(A), SprBlsCol-Dmg/EndRdx(42), SprBlsCol-Acc/Dmg/EndRdx(42), SprBlsCol-Acc/Dmg/Rchg(42), SprBlsCol-Dmg/EndRdx/Acc/Rchg(43), AchHee-ResDeb%(43) Level 38: Crushing Uppercut -- Hct-Dmg(A), Hct-Dmg/Rchg(43), Hct-Acc/Dmg/Rchg(45), Hct-Acc/Rchg(45), Hct-Dmg/EndRdx(45), Hct-Dam%(46) Level 41: Boxing -- Empty(A) Level 44: Tough -- RctArm-ResDam(A), RctArm-EndRdx(46), RctArm-ResDam/EndRdx(46), RctArm-ResDam/EndRdx/Rchg(48) Level 47: Weave -- LucoftheG-Def/Rchg+(A), LucoftheG-Def(48), LucoftheG-Def/EndRdx(48) Level 49: Maneuvers -- LucoftheG-Def/Rchg+(A), LucoftheG-Def(50), LucoftheG-Def/EndRdx(50) Level 1: Brawl -- Empty(A) Level 1: Gauntlet 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 2: Swift -- Empty(A) Level 2: Health -- Mrc-Rcvry+(A), Pnc-Heal/+End(13), NmnCnv-Regen/Rcvry+(15) Level 2: Hurdle -- Empty(A) Level 2: Stamina -- PrfShf-End%(A), PrfShf-EndMod(15), PrfShf-EndMod/Rchg(17) Level 1: Combo Level 1 Level 1: Combo Level 2 Level 1: Combo Level 3 Level 50: Assault Radial Embodiment Level 4: Ninja Run Level 50: Agility Core Paragon Level 0: Freedom Phalanx Reserve Level 0: The Atlas Medallion Level 50: Mighty Core Final Judgement Level 50: Reactive Radial Flawless Interface Level 50: Longbow Radial Superior Ally Level 50: Barrier Core Epiphany ------------