No end reds in death shroud or CoF? I think you might want to add some their, they're your heaviest toggles by a fairly long way.
In comparison the second end red in the shields do relatively little, if you want somewhere to get the slots from
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
Dark Regen without heal enhancements in is still very good so you probably don't need 3 of them in there. You can normally fill your health bar up when surrounded by 2 or 3 enemies. On the other hand it does cost alot of end so I'd consider putting a couple of end reds in there in stead of heals.
I slotted dark regen with 2 end redux & 2 recharge.
Don't need any heals in it.
you might want at least 1 accuracy in it, to make sure it hits. the last thing you want is waste tons of end on doing nothing 
specially if you're DA.
@Shift
Shift 50 DM/DA Scrapper ][ TTL 50 Kat/Reg Scrapper ][ Shabriel 50 Peacebringer ][ Ion Shift 46 Rad/Rad Corruptor ][ Thermal Shift 35 Fire/Fire Blaster
"A Scrapper is a lot like a chainsaw. Somewhat hard to handle, incredibly dangerous, and by far the most fun when wielded by the slightly insane."
I would consider taking Murky Cloud earlier as it is your Cold/Fire/Energy/Neg-Energy protection leaving it till lvl30 is a little late, also Cloak of darkness only offers a 5% defence buff with three SO's in it might consider putting them elsewhere, but apart from that it looks cool
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Some general advice
Dark Regen needs to be slotted for ACC ( 1 is fine ) end reduction and recharge, I would 6 slot it. It's that good.
Don't bother with Health slotting, you one of the best self heals in the game.
I would slot super jump either, it's fine unslotted, especially with Hurdle.
Get Cloak of Fear ASAP, it is one of the best defensive power in the secondary. Slot it with 2xAccs 2-3 end reds and 1-2 fear durations or to hit buffs.
Slot Combat Jumping for a single Def Buf, the jump is unnecessary. Whilst not much defence you have hurdle already.
I'm not sure Death Shroud is that great a power... I'd probably skip it, DA is enough of an end hog in the early levels without another one. I spent most of my time pre stamina with my toggles off.
@Unthing ... Mostly on Union.
I'm looking into levelling a Kat/DA Scrapper with the following build:
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Exported from Ver: 1.7.6.0 of the CoH_CoV Character Builder - (http://sherksilver.coldfront.net/index.php)
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Name: Drakona
Level: 50
Archetype: Scrapper
Primary: Katana
Secondary: Dark Armor
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01) --> Sting of the Wasp==> Acc(1) Acc(3) Dmg(7) Dmg(31) Dmg(36)
01) --> Dark Embrace==> DmgRes(1) DmgRes(5) DmgRes(13) EndRdx(46) EndRdx(46)
02) --> Flashing Steel==> Acc(2) Acc(3) Dmg(7) Dmg(34) Dmg(37)
04) --> Death Shroud==> Acc(4) Acc(5) Acc(11)
06) --> Hurdle==> Jump(6)
08) --> Divine Avalanche==> Acc(8) Acc(9) DefBuf(9) DefBuf(34) DefBuf(37)
10) --> Obsidian Shield==> DmgRes(10) DmgRes(11) DmgRes(13) EndRdx(46) EndRdx(50)
12) --> Combat Jumping==> Jump(12)
14) --> Super Jump==> Jump(14) Jump(15) Jump(15)
16) --> Dark Regeneration==> Acc(16) Acc(17) Heal(17) Heal(27) Heal(37)
18) --> Health==> Heal(18) Heal(19) Heal(19)
20) --> Stamina==> EndMod(20) EndMod(21) EndMod(21)
22) --> The Lotus Drops==> Acc(22) Acc(23) Dmg(23) Dmg(34) Dmg(39)
24) --> Cloak Of Darkness==> DefBuf(24) DefBuf(25) DefBuf(25) EndRdx(27) EndRdx(48)
26) --> Acrobatics==> EndRdx(26)
28) --> Soaring Dragon==> Acc(28) Acc(29) Dmg(29) Dmg(36) Dmg(40) KB_Dist(43)
30) --> Murky Cloud==> DmgRes(30) DmgRes(31) DmgRes(31) EndRdx(45) EndRdx(45)
32) --> Golden Dragonfly==> Acc(32) Acc(33) Dmg(33) Dmg(33) Dmg(40) KB_Dist(40)
35) --> Build Up==> Rechg(35) Rechg(36)
38) --> Soul Transfer==> DisDur(38) DisDur(39) DisDur(39)
41) --> Focused Accuracy==> TH_Buf(41) TH_Buf(42) TH_Buf(42) EndRdx(42) EndRdx(43) EndRdx(43)
44) --> Conserve Power==> Rechg(44) Rechg(45)
47) --> Cloak Of Fear==> Acc(47) Acc(48) TH_DeBuf(48) TH_DeBuf(50) TH_DeBuf(50)
49) --> Calling the Wolf==> Taunt(49)
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01) --> Sprint==> Run(1)
01) --> Brawl==> Dmg(1)
01) --> Critical Hit==> Empty(1)
02) --> Rest==> Rechg(2)
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Any advice would be great, as I haven't tried out much yet.