Back to CM9. May be featureless, but it's stable and I wanted to check out the new nightly anyway.
I did V6 ~ 3 times, after every kernel change (as recommended, IIRC). Never got less than 100% either.
The kernels I tried were the stable imo 3.00 (1 reboot), the nightly after that (1 reboot), and weirdly enough--franco's milestone #2 2 reboots. The latter 2 happened within a half an hour of each other, and the exp imo kernel happened about an hour before that. Wasn't undervolted aggressively at all.
I did notice, however, what happened: when switching from 4G to 3G or WiFi to mobile, it would lock up and immediately reboot if it was under load. Perhaps it got too hot? Who knows. But I noticed it was either downloading something (like updates) and switching networks simultaneously. After the first reboot I charged my Incredible just in case, but luckily it made it through the night.
Across all kernels I also noticed a weird propensity for the screen to stay on and not go to sleep.