GH>KA early never will be optimal with 68 P2...
I'd want to check if that only works near the corner or it works anywhere midscreen. I'm inclined to believe the latter.
Also note that it's unburstable after the CT, and you can probably do it after raw CT if you want something a bit more practical than fatal Blood Scythe.
Tsukika's meter gain is the same. How the new system works is that meter gain scales along with the rest of the combo, so at the very end you're gaining 0-1 meter per hit.
Sorry, I forgot where I was.