sammy64-- I know you know what you're doing, man, just if one set of blades works and the other doesn't, there are only a few things it could be. I've double checked and found I hadn't gotten a set balanced as well as I thought, so that's why I asked.

BTW, I'm going to try a 12T to drop my governed RPM down around 2400 or so and see how it flies at that speed-- I definitely expect it to cool the motor off a bit, and probably get better flight times as well, but don't know yet.