[BrianG]

Yeah, mine had that gap as well filled with thermal grease. That stuff is only supposed to fill microscopic imperfections between mating surfaces, not fill gaps. It's thermal conductivity goes WAY down when it is too thick (by "too thick", I mean like 0.1mm). In my case, it looks like the thickness of the motor wire solder joints were keeping the PCB from sitting where it should. I'd try to resolder it as well, but have you ever soldered/desoldered a multilayered board? It sucks. You need quite a bit of heat to keep the traces from sinking too much, but then nearby sensitive components can get too hot.

IMO, I think BK should offer a discount on an exchange program to replace ones like ours with a properly assembled one. It would benefit them in the long run for better customer service and a more reliable product. Already, I've heard a number of people with blown ESCs and for some, it's not the first they've blown...