MGM Compro 16016 - NEED HELP

Well,

Get this, the 5S2P 8Ah pack that I ordered from truerc on Saturday, showed up this morning. That guys doesn't mess around. Anyway, running on 5S, I have to use the external bec.

I'm still messing with it. That clacking sound that I was hearing was my front diff. The case cracked. I replaced the case and it cracked again. I'm hoping that there was a high spot on one of my gears causing the cracking. If not, then either the compro system is too powerful or too abrupt, since I never had this problem running my MM on 4S with the same motor.