Acc/Acc/Rech/Def/Def/Def is the best survivability SO slotting. That makes you able to double-stack it constantly (rather than a short period of non-overlap) and hit the soft Defence cap with two applications.
With IOs/HOs? The best method I've found is:
Acc/Dam HO
Acc/Dam HO
Acc/Dam HO
Level 50 LOTG +Defense IO
Level 50 LOTG Global +7.5% Rech IO
Recharge/Defense/ToHitBuff HO
Works out at 99% Accuracy, 99% Damage, 64.44% Defense (3 SOs is 60%), 33% Recharge.
I just got this power AND i must say Wow the animation is fantastic im not sure if its a recycled animation (i aint seen it anywhere else) and secondly its adds so much survivability to my scrapper i was pretty scared to get the power but its cool, ashame i dont do any damage now! I kid i kid
1acc 3dam 2def for me!