Fimbo I haven't looked for the hot spot for when 1 point in GftT is enough to keep scorpid happy but I'm certain that 35% crit is enough.
Aern I do try to stack all the haste buffs for BW's and yes I only used AotB for the first two BW's mainly because in the past I've found myself without aspect while running to Grobbulus trash, damn rapid fingers clicking aspect off.
That dps difference seems to pile up from various things which in the end results in a big difference. CS, kibler's bits, slightly slower kill time, dodge RNG, slightly lower AP and AotB are the things I can find when comparing WWS's.
Thing is, with scorpid 3/3 CS is actually pretty huge advantage over 1/3. Our gear and raid setup is rather similar and claw dps difference is almost 210. Those two extra points in longevity essentially do nothing unless you change glyph of bestial wrath to serpent sting, certainly not 105 dps per talent point.
I guess if we got one more reset before 3.0.8 I'll shift two points from rapid killing to imp HM as they give zero dps on Patchwerk and push for even higher numbers assuming that they don't hotfix HAT rogues.