Considering my Crushing Field slotting

I love Proccing Field on my Grav/Kin; it's his primary means of inflicting AOE damage and Gravitational Anchor is nice to have for its help in mitigating the relatively weak AOE control of the Gravity set. Presently, Crushing Field is slotted with every crafted proc it can take, plus one slot with an Acc/Dam Posi Blast. Running Tactics and considering other set bonuses this gives Crushing Field an accuracy of 124% which seems fine to me.

I am thinking about adding a Controller ATO proc, but don't know whether I should replace the Acc/Dam or one of the two Lethal procs it already has. Replacing the Acc/Dam brings the accuracy down to 104%, with Tactics running. I'm not that good with accuracy numbers so I'm asking here: How much of a decrease to his ability to hit things would this represent? This is running at +0 or +1 solo, and often up to +3 on a team though on teams I have other concerns than my controller's AOE damage.




His build is below if it matters - current Incarnate powers are Spiritual alpha, Void judgement, Reactive interface, Clarion destiny, and Cimeroran lore:

Hero Plan by Mids' Hero Designer 1.955
http://www.cohplanner.com/

Click this DataLink to open the build!

Hour Thief: Level 50 Magic Controller
Primary Power Set: Gravity Control
Secondary Power Set: Kinetics
Power Pool: Teleportation
Power Pool: Speed
Power Pool: Fighting
Power Pool: Leadership
Ancillary Pool: Mace Mastery

Hero Profile:
Level 1: Crush -- Enf'dOp-Acc/Rchg(A), Enf'dOp-EndRdx/Immob(3), Enf'dOp-Acc/EndRdx(3), Enf'dOp-Immob/Rng(5), Enf'dOp-Acc/Immob/Rchg(5), Enf'dOp-Acc/Immob(7)
Level 1: Transfusion -- Nictus-Heal/HP/Regen/Rchg(A), Nictus-Acc/Heal(7), Nictus-Acc/EndRdx/Heal/HP/Regen(9), Nictus-Acc/EndRdx/Rchg(9), Dct'dW-Heal/Rchg(11)
Level 2: Gravity Distortion -- BasGaze-Acc/Hold(A), BasGaze-Acc/Rchg(11), BasGaze-Rchg/Hold(13), BasGaze-Acc/EndRdx/Rchg/Hold(13), Lock-%Hold(15), Lock-Rchg/Hold(15)
Level 4: Teleport -- Jnt-Rng(A), Jnt-EndRdx/Rng(17)
Level 6: Propel -- Decim-Acc/Dmg(A), Decim-Dmg/EndRdx(17), Decim-Dmg/Rchg(19), Decim-Acc/EndRdx/Rchg(19), Decim-Acc/Dmg/Rchg(21)
Level 8: Crushing Field -- Posi-Acc/Dmg(A), Posi-Dam%(21), JavVoll-Dam%(23), ImpSwft-Dam%(23), TotHntr-Dam%(25), GravAnch-Hold%(25)
Level 10: Siphon Speed -- Acc-I(A), Acc-I(27), RechRdx-I(27), RechRdx-I(29)
Level 12: Recall Friend -- Zephyr-ResKB(A)
Level 14: Hasten -- RechRdx-I(A), RechRdx-I(29), RechRdx-I(31)
Level 16: Increase Density -- ResDam-I(A)
Level 18: Gravity Distortion Field -- BasGaze-Acc/Hold(A), BasGaze-Acc/Rchg(31), BasGaze-Rchg/Hold(31), BasGaze-EndRdx/Rchg/Hold(33), Lock-Acc/EndRdx/Rchg/Hold(33), Lock-%Hold(33)
Level 20: Speed Boost -- EndMod-I(A)
Level 22: Boxing -- KntkC'bat-Knock%(A), KntkC'bat-Dmg/Rchg(34), KntkC'bat-Dmg/EndRdx(34), KntkC'bat-Acc/Dmg(34)
Level 24: Tough -- RctvArm-EndRdx(A), RctvArm-ResDam(36), RctvArm-ResDam/EndRdx/Rchg(36), RctvArm-ResDam/EndRdx(36), S'fstPrt-ResDam/Def+(37)
Level 26: Wormhole -- Stpfy-Acc/Stun/Rchg(A), Stpfy-Acc/Rchg(37), Stpfy-EndRdx/Stun(37), Stpfy-Acc/EndRdx(39), Stpfy-Stun/Rng(39)
Level 28: Weave -- LkGmblr-Def/EndRdx(A), LkGmblr-EndRdx/Rchg(39), LkGmblr-Def/EndRdx/Rchg(40), LkGmblr-Rchg+(40)
Level 30: Maneuvers -- LkGmblr-Def/EndRdx(A), LkGmblr-EndRdx/Rchg(40), LkGmblr-Def/EndRdx/Rchg(42), LkGmblr-Rchg+(42)
Level 32: Singularity -- ExRmnt-Acc/Dmg(A), ExRmnt-Dmg/EndRdx(42), ExRmnt-Acc/Dmg/Rchg(43), ExRmnt-EndRdx/Dmg/Rchg(43)
Level 35: Transference -- Efficacy-EndMod(A), Efficacy-EndMod/Acc/Rchg(43), Efficacy-Acc/Rchg(45), Efficacy-EndMod/Acc(45)
Level 38: Fulcrum Shift -- Acc-I(A), Acc-I(45), RechRdx-I(46), RechRdx-I(46)
Level 41: Scorpion Shield -- LkGmblr-Def/EndRdx(A), LkGmblr-Def/EndRdx/Rchg(46), LkGmblr-Rchg+(48), LkGmblr-EndRdx/Rchg(48)
Level 44: Tactics -- EndRdx-I(A), EndRdx-I(48)
Level 47: Vengeance -- LkGmblr-Rchg+(A)
Level 49: Long Range Teleport -- RechRdx-I(A)
Level 1: Brawl -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(50), KntkC'bat-Dmg/Rchg(50), KntkC'bat-Knock%(50)
Level 1: Prestige Power Surge -- Empty(A)
Level 1: Prestige Power Dash -- Empty(A)
Level 1: Prestige Power Quick -- Empty(A)
Level 1: Prestige Power Rush -- Empty(A)
Level 1: Prestige Power Slide -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- RechRdx-I(A)
Level 2: Swift -- Run-I(A)
Level 2: Hurdle -- Jump-I(A)
Level 2: Health -- Mrcl-Rcvry+(A)
Level 2: Stamina -- P'Shift-End%(A)
Level 1: Containment
Level 4: Ninja Run
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Against enemies with no defense or tohit modifying powers you can easily check your hit chance by doing changing the base tohit in Mids'. If the accuracy for the power is equal or greater than 95%, you'll have 95% chance to hit enemies of that level (provided they don't debuff your tohit or buff their own defense). IIRC the values for base tohit are 75% for +0, 65% for +1, 56% for +2, 48% for +3 and 39% for +4.