I run my MM with 3s w/ & w/o bec and i don't notice a difference in temps. I've also ran my novak hv max off a single 4s pack with and without bec and have not noticed any difference in temps. Could be the servos im using however. Cheap servos have always worked great for me.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy
The 2 custom Novak HVs will be here today and I'll be posting pictures of them. It should be cool to have the first ever HV1.5 and the 2 known in existance HV2.5 motors . I'm going to rub this in here for a while .