This is what I have for my elec/shield scrapper. I use it to farm +4's rather easily, but it may be the way I play.
@Sir Giles/Fiery Transfer
Hero Plan by Mids' Hero Designer 1.92
http://www.cohplanner.com/Voltaic Assault I19: Level 50 Technology Scrapper
Primary Power Set: Electrical Melee
Secondary Power Set: Shield Defense
Power Pool: Speed
Power Pool: Fighting
Power Pool: Leadership
Power Pool: Leaping
Ancillary Pool: Body Mastery
Hero Profile:
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Level 1: Charged Brawl Mako-Acc/Dmg:50(A), Mako-Dmg/EndRdx:50(42), Mako-Dmg/Rchg:50(43), Mako-Acc/EndRdx/Rchg:50(43), Mako-Acc/Dmg/EndRdx/Rchg:50(43), Mako-Dam%:50(45)
Level 1: Deflection LkGmblr-Rchg+:50(A), LkGmblr-Def/EndRdx:50(3), GftotA-Run+:40(46), GftotA-Def/EndRdx:40(48)
Level 2: Jacobs Ladder Sciroc-Dmg/Rchg:50(A), Sciroc-Acc/Rchg:50(37), Sciroc-Dmg/EndRdx:50(40), Sciroc-Acc/Dmg/EndRdx:50(42), Sciroc-Dam%:50(42)
Level 4: Battle Agility LkGmblr-Rchg+:50(A), LkGmblr-Def/EndRdx:50(5), GftotA-Run+:40(46), GftotA-Def/EndRdx:40(50)
Level 6: Build Up AdjTgt-ToHit/EndRdx:50(A), AdjTgt-ToHit/Rchg:50(7), AdjTgt-ToHit/EndRdx/Rchg:50(7), AdjTgt-EndRdx/Rchg:50(9), AdjTgt-Rchg:50(9)
Level 8: True Grit H'zdH-Heal/EndRdx:40(A), H'zdH-Heal:40(11), Mrcl-Heal:40(11), Mrcl-Heal/EndRdx:40(13)
Level 10: Active Defense RechRdx-I:50(A)
Level 12: Thunder Strike Sciroc-Acc/Rchg:50(A), Sciroc-Dmg/Rchg:50(13), Sciroc-Dmg/EndRdx:50(15), Sciroc-Acc/Dmg/EndRdx:50(17), Sciroc-Dam%:50(19)
Level 14: Hasten RechRdx-I:50(A), RechRdx-I:50(15)
Level 16: Against All Odds EndRdx-I:50(A), EndRdx-I:50(17)
Level 18: Chain Induction Mako-Acc/Dmg:50(A), Mako-Dam%:50(19), Mako-Dmg/EndRdx:50(21), Mako-Dmg/Rchg:50(29), Mako-Acc/EndRdx/Rchg:50(31), Mako-Acc/Dmg/EndRdx/Rchg:50(31)
Level 20: Super Speed Zephyr-Travel:50(A), Zephyr-Travel/EndRdx:50(21)
Level 22: Boxing Stpfy-Acc/Rchg:50(A), Stpfy-EndRdx/Stun:50(23), Stpfy-Acc/EndRdx:50(23), Stpfy-Stun/Rng:50(25), Stpfy-Acc/Stun/Rchg:50(27)
Level 24: Tough S'fstPrt-ResDam/EndRdx:30(A), S'fstPrt-ResDam/Def+:30(25)
Level 26: Weave LkGmblr-Rchg+:50(A), LkGmblr-Def/EndRdx:50(27), GftotA-Run+:40(46), GftotA-Def/EndRdx:40(50)
Level 28: Phalanx Fighting LkGmblr-Rchg+:50(A), Ksmt-ToHit+:30(29)
Level 30: Maneuvers LkGmblr-Rchg+:50(A), GftotA-Run+:40(31), GftotA-Def/EndRdx/Rchg:40(34), GftotA-Def/EndRdx:40(45)
Level 32: Lightning Rod Oblit-Acc/Rchg:50(A), Oblit-Dmg/Rchg:50(33), Oblit-Acc/Dmg/Rchg:50(33), Oblit-Acc/Dmg/EndRdx/Rchg:50(33), Oblit-%Dam:50(34), Oblit-Dmg:50(34)
Level 35: Shield Charge Oblit-Acc/Rchg:50(A), Oblit-Dmg/Rchg:50(36), Oblit-Acc/Dmg/Rchg:50(36), Oblit-Acc/Dmg/EndRdx/Rchg:50(36), Oblit-%Dam:50(37), Oblit-Dmg:50(37)
Level 38: Tactics GSFC-ToHit:50(A), GSFC-ToHit/Rchg:50(39), GSFC-ToHit/Rchg/EndRdx:50(39), GSFC-Rchg/EndRdx:50(39), GSFC-ToHit/EndRdx:50(40), GSFC-Build%:50(40)
Level 41: Conserve Power RechRdx-I:50(A), RechRdx-I:50(48)
Level 44: Physical Perfection P'Shift-End%:50(A), P'Shift-EndMod:50(45)
Level 47: Assault EndRdx-I:50(A), EndRdx-I:50(48)
Level 49: Combat Jumping GftotA-Run+:30(A), GftotA-Def:30(50)
Level 0: Freedom Phalanx Reserve
Level 0: Portal Jockey
Level 0: Task Force Commander
Level 0: The Atlas Medallion
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Level 1: Brawl Empty(A)
Level 1: Sprint ULeap-Stlth:50(A)
Level 2: Rest RechRdx-I:50(A)
Level 1: Critical Hit
Level 4: Ninja Run
Level 2: Swift Run-I:50(A)
Level 2: Hurdle Jump-I:50(A)
Level 2: Health Mrcl-Heal:40(A), Mrcl-Heal/EndRdx:40(3)
Level 2: Stamina P'Shift-End%:50(A), P'Shift-EndMod:50(5)