No Instant Healing?
For Regen, you need to slot Integration, Dull Pain, Reconstruction and Quick Recovery first. Slots in Fast Healing and Health can come later, and I don't really recommend slotting Resilience unless you have too many slots as the additional damage resistance isn't really worth it.
You'll want to fit Instant healing in somewhere and Build Up is a bit late at 28.
if you're gonna run tactics, make the most of it by 3 slotting it, then you just might be able to drop Focussed acc at times. build up much earlier and no Instant Healing? O.o
Defiant 50's
Many and varied!
@Miss Chief
My 2p 
Drop a recharge out of Hack and slice, they are fast enough with 1, drop a resistance out of resilience it's hardly doing anything, drop the slots out of health. Put these gained slots towards properly slotting tactics/assualt and tp foe if you intend to use it seriously in PvP.
And like others have said, you have Hasten in the build, so IH should be there fully slotted aswell. 
Ive put the following build together, but im still not 100% sure about it. The main issue I have is deciding what to slot and when - any advice greatly appreciated
1) --> Hack ==>(1 Acc, 3 Dam, 2 Rchg)
1) --> Fast Healing ==>(3 Heal)
2) --> Slice ==>(1 Acc, 3 Dam, 2 Rchg)
4) --> Reconstruction ==>(3 Rchg, 3 Heal)
6) --> Quick Recovery ==>(3 End Mod)
8) --> Parry ==>(1 Acc, 2 Dam, 3 DefBuff)
10) --> Dull Pain ==>(3 Rchg, 3 Heal)
12) --> Teleport Foe ==>(1 Rchg)
14) --> Teleport ==>(2 EndRed, 1 Range)
16) --> Integration ==>(3 Heal)
18) --> Whirling Sword ==>(1 Acc, 3 Dam, 2 Rchg)
20) --> Assault ==>(1 EndRed)
22) --> Tactics ==>(1 EndRed)
24) --> Swift ==>(1 Run)
26) --> Disembowel ==>(1 Acc, 3 Dam, 2 Rchg)
28) --> Build Up ==>(3 Rchg)
30) --> Health ==>(3 Heal)
32) --> Head Splitter ==>(1 Acc, 3 Dam, 2 Rchg)
35) --> Stamina ==>(3 End Mod)
38) --> Hasten ==>(3 Rchg)
41) --> Focused Accuracy ==>(3 ToHitBuf, 1 EndRed)
44) --> Laser Beam Eyes ==>(1 Acc, 3 Dam, 2 Rchg)
47) --> Resilience ==>(3 DamRes)
49) --> Super Speed ==>(1 Run, 1 EndRed)
I've never played a scrapper before, so I dont know if im better of slotting my secondarys, or to focus on my attacks.
Thanks in advance guys