Staff/DA stalker-Having trouble

Hello, I'm having a really hard time with this. This is a somewhat budget conscious build. Can anyone offer critique?




Villain Plan by Mids' Villain Designer 1.956
http://www.cohplanner.com/

Click this DataLink to open the build!

Level 50 Natural Stalker
Primary Power Set: Staff Fighting
Secondary Power Set: Dark Armor
Power Pool: Leadership
Power Pool: Fighting
Ancillary Pool: Soul Mastery

Villain Profile:
Level 1: Mercurial Blow -- KntkC'bat-Knock%(A), KntkC'bat-Acc/Dmg(3), KntkC'bat-Dmg/EndRdx(3), KntkC'bat-Dmg/Rchg(5), C'ngImp-Acc/Dmg/Rchg(5)
Level 1: Hide -- LkGmblr-Rchg+(A)
Level 2: Precise Strike -- T'Death-Dam%(A), T'Death-Dmg/EndRdx/Rchg(25), T'Death-Acc/Dmg/EndRdx(27), T'Death-Dmg/Rchg(27), T'Death-Dmg/EndRdx(29), T'Death-Acc/Dmg(29)
Level 4: Dark Embrace -- TtmC'tng-ResDam(A), TtmC'tng-ResDam/EndRdx(39)
Level 6: Assassin's Staff -- StalkersG-Acc/Dmg(A), StalkersG-Dmg/Rchg(7), StalkersG-Acc/Dmg/Rchg(7), StalkersG-Dmg/EndRdx/Rchg(17), StalkersG-Acc/Dmg/EndRdx/Rchg(23), StalkersG-Rchg/Hide%(25)
Level 8: Guarded Spin -- Oblit-Acc/Dmg/EndRdx/Rchg(A), Oblit-%Dam(9), Oblit-Dmg(9), Oblit-Dmg/Rchg(13), Oblit-Acc/Rchg(13), Oblit-Acc/Dmg/Rchg(17)
Level 10: Shadow Dweller -- LkGmblr-Rchg+(A), LkGmblr-Def(11), LkGmblr-Def/EndRdx(11)
Level 12: Murky Cloud -- TtmC'tng-ResDam(A), TtmC'tng-ResDam/EndRdx(39)
Level 14: Maneuvers -- LkGmblr-Rchg+(A), LkGmblr-Def(15), LkGmblr-Def/EndRdx(15)
Level 16: Obsidian Shield -- TtmC'tng-ResDam(A), TtmC'tng-ResDam/EndRdx(43)
Level 18: Eye of the Storm -- Oblit-%Dam(A), Oblit-Acc/Dmg/EndRdx/Rchg(19), Oblit-Dmg(19), Oblit-Acc/Rchg(21), Oblit-Dmg/Rchg(21), Oblit-Acc/Dmg/Rchg(23)
Level 20: Dark Regeneration -- Theft-+End%(A), Theft-Acc/EndRdx/Heal(39), Numna-Heal(40), Numna-Heal/EndRdx/Rchg(40), Numna-Heal/EndRdx(40), Nictus-Acc/EndRdx/Heal/HP/Regen(45)
Level 22: Boxing -- Empty(A)
Level 24: Build Up -- RechRdx-I(A)
Level 26: Serpent's Reach -- Dev'n-Acc/Dmg/EndRdx/Rchg(A), Dev'n-Acc/Dmg(46), Dev'n-Acc/Dmg/Rchg(46), Dev'n-Dmg/EndRdx(48)
Level 28: Cloak of Fear -- U'spkT-Stun%(A), Abys-Dam%(45), Abys-EndRdx/Fear(45), Abys-Acc/Fear/Rchg(46)
Level 30: Tough -- S'fstPrt-ResDam/Def+(A), S'fstPrt-ResKB(31), ImpArm-ResDam(31), ImpArm-ResDam/EndRdx(31)
Level 32: Sky Splitter -- FrcFbk-Rechg%(A), KntkC'bat-Knock%(33), KntkC'bat-Dmg/EndRdx(33), KntkC'bat-Dmg/Rchg(33), KntkC'bat-Acc/Dmg(34), C'ngImp-Acc/Dmg(34)
Level 35: Oppressive Gloom -- RzDz-Acc/Rchg(A), RzDz-Acc/Stun/Rchg(36), RzDz-Immob%(36), RzDz-Acc/EndRdx(36), RzDz-EndRdx/Stun(37)
Level 38: Placate -- RechRdx-I(A)
Level 41: Soul Transfer -- Oblit-Acc/Dmg/EndRdx/Rchg(A), Oblit-%Dam(42), Oblit-Dmg(42), Oblit-Acc/Rchg(42), Oblit-Dmg/Rchg(43), Oblit-Acc/Dmg/Rchg(43)
Level 44: Dark Blast -- Empty(A)
Level 47: Weave -- LkGmblr-Rchg+(A), LkGmblr-Def(48), LkGmblr-Def/EndRdx(48)
Level 49: Shadow Meld -- LkGmblr-Rchg+(A), LkGmblr-Def/Rchg(50), LkGmblr-Def/EndRdx/Rchg(50), RechRdx-I(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 4: Swift -- Empty(A)
Level 4: Health -- Mrcl-Rcvry+(A), Numna-Regen/Rcvry+(37)
Level 4: Hurdle -- Empty(A)
Level 4: Stamina -- EndMod-I(A), EndMod-I(34), P'Shift-End%(37)
Level 1: Combo Level 1
Level 1: Combo Level 2
Level 1: Combo Level 3
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Can anyone chime in? Or did i break some sort of unwritten rule?