Claws/SR top end build, room for improvement?
Very nice.
Not sure I'd call them improvements, more a difference of priorities. The build has a ton of recharge and with it resulting damage output. What it is yielding is survivability in that exchange.
Those 'weak' spots in survivability are Max Health with the correspondingly lower passive regen. Accuracy/Final to hit vs +4's is also a bit soft, reliant on Follow Up hitting to boost things to the 95+% range.
I've had my claws/SR die vs Kahn on a Master attempt with Khan under 5000 health. How? Got two shotted (stunned by that ugly massive aoe, then picked off with a second shot with most of my defenses surpressed do to the mez). While it was a once in a blue moon thing the above build shares the same vulnerability. He did around 1800 damage with those 2 shots. It can't happen on her current build because Kahn would have to attack and hit her a 3rd time before I could recover to pop greens, hit Aid Self or receive a teammates help, as she now has 1953 Health vs the earlier builds 1750'ish. Flip side is I suspect your Pylon Times would be miles better, she can do it readily enough but her dps is, I'm guessing, nowhere near what this build can do 
Find a way to slip a Kismet +6% into the build. It would move Follow Up from just shy of 80% vs +4's to 92% vs +4's. Similarly improves the accuracy on Focus and Eviscerate as well making them less reliant on Follow Up hitting so the hopefully rare miss by Follow Up doesn't lead to several more misses. Not sure there is a whole lot you can do about the Max Health, it's a trade off more than anything of recharge/dps vs survival.
PS: Love the enhancement slotting in Spin.
Out of curiosity, is anything really +4 anymore once you're level-shifted?
As is, it looks like a great build to me. If you wanted to fit in the Kismet and a little more accuracy, I've got an option here: Click this DataLink to open the build!. All I did was rework Physical Perfection to free up a couple slots and I don't know if that's necessary.
Good point, nothing that I know of yet. And he has enough accuracy to hit +3's in the build as is.
This is my planned build for my Claws/SR Scrapper, running FU>F>E. Anyone who wants to see how they can improve it, your input is welcome.
Despite the fact that it says Musculature Radial Boost, it should be Musculature Core Paragon.
Hero Plan by Mids' Hero Designer 1.92
http://www.cohplanner.com/
Click this DataLink to open the build!
Level 50 Magic Scrapper
Primary Power Set: Claws
Secondary Power Set: Super Reflexes
Power Pool: Fighting
Power Pool: Leaping
Power Pool: Medicine
Power Pool: Speed
Ancillary Pool: Body Mastery
Hero Profile:
Level 1: Swipe -- Acc-I(A)
Level 1: Focused Fighting -- RedFtn-Def(A), RedFtn-EndRdx(3), RedFtn-Def/EndRdx(3), RedFtn-Def/Rchg(5), RedFtn-Def/EndRdx/Rchg(5)
Level 2: Focused Senses -- RedFtn-Def(A), RedFtn-EndRdx(7), RedFtn-Def/EndRdx(7), RedFtn-Def/Rchg(9), RedFtn-Def/EndRdx/Rchg(9)
Level 4: Agile -- LkGmblr-Rchg+(A), LkGmblr-Def(11), DefBuff-I(11)
Level 6: Spin -- Oblit-Acc/Dmg/EndRdx/Rchg(A), Oblit-Acc/Dmg/Rchg(13), M'Strk-Acc/Dmg/EndRdx(13), M'Strk-Dmg/EndRdx/Rchg(15), FotG-Acc/Dmg/End/Rech(15), FotG-Acc/End/Rech(17)
Level 8: Follow Up -- Hectmb-Dmg(A), Hectmb-Acc/Dmg/Rchg(17), Hectmb-Acc/Rchg(19), Hectmb-Dmg/EndRdx(19), Hectmb-Dam%(21), EndRdx-I(21)
Level 10: Practiced Brawler -- EndRdx-I(A)
Level 12: Boxing -- Acc-I(A)
Level 14: Tough -- S'fstPrt-ResDam/Def+(A), GA-3defTpProc(23), S'fstPrt-ResDam/EndRdx(48), HO:Ribo(50), HO:Ribo(50)
Level 16: Dodge -- LkGmblr-Rchg+(A), LkGmblr-Def(27), DefBuff-I(27)
Level 18: Focus -- Apoc-Dmg(A), Apoc-Acc/Dmg/Rchg(29), Apoc-Acc/Rchg(29), Apoc-Dmg/EndRdx(31), Apoc-Dam%(31), EndRdx-I(31)
Level 20: Quickness -- Run-I(A)
Level 22: Weave -- RedFtn-Def(A), RedFtn-EndRdx(23), RedFtn-Def/EndRdx(25), RedFtn-Def/Rchg(25), RedFtn-Def/EndRdx/Rchg(33)
Level 24: Combat Jumping -- LkGmblr-Rchg+(A), HO:Enzym(33)
Level 26: Eviscerate -- Armgdn-Dmg(A), Armgdn-Acc/Dmg/Rchg(33), Armgdn-Acc/Rchg(34), Armgdn-Dmg/EndRdx(34), Armgdn-Dam%(34), FotG-ResDeb%(36)
Level 28: Lucky -- LkGmblr-Rchg+(A), LkGmblr-Def(36), DefBuff-I(36)
Level 30: Aid Other -- Heal-I(A)
Level 32: Shockwave -- Ragnrk-Dmg/Rchg(A), Ragnrk-Acc/Dmg/Rchg(37), Ragnrk-Acc/Rchg(37), Ragnrk-Dmg/EndRdx(37), Ragnrk-Dmg(39), FrcFbk-Rchg/EndRdx(39)
Level 35: Evasion -- RedFtn-Def(A), RedFtn-EndRdx(39), RedFtn-Def/EndRdx(40), RedFtn-Def/Rchg(40), RedFtn-Def/EndRdx/Rchg(40)
Level 38: Aid Self -- Dct'dW-Heal(A), Dct'dW-Rchg(42), Dct'dW-Heal/EndRdx(42), Dct'dW-Heal/Rchg(42), Dct'dW-Heal/EndRdx/Rchg(43), IntRdx-I(43)
Level 41: Conserve Power -- RechRdx-I(A)
Level 44: Physical Perfection -- Numna-Regen/Rcvry+(A), Numna-Heal(45), Mrcl-Rcvry+(45), Mrcl-Heal(45), EndMod-I(46), EndMod-I(46)
Level 47: Hasten -- RechRdx-I(A), RechRdx-I(48)
Level 49: Elude -- LkGmblr-Rchg+(A)
Level 0: Freedom Phalanx Reserve
Level 0: Portal Jockey
Level 0: Task Force Commander
Level 0: The Atlas Medallion
Level 50: Musculature Radial Boost
------------
Level 1: Brawl -- Acc-I(A)
Level 1: Critical Hit
Level 1: Sprint -- Run-I(A)
Level 2: Rest -- RechRdx-I(A)
Level 4: Ninja Run
Level 2: Swift -- Run-I(A)
Level 2: Health -- RgnTis-Regen+(A), Heal-I(50)
Level 2: Hurdle -- Jump-I(A)
Level 2: Stamina -- P'Shift-End%(A), P'Shift-EndMod/Acc(43), P'Shift-EndMod(46), P'Shift-EndMod/Rchg(48)