brushless conversion help!

[CerberusVI]

So I've converted my associated monster gt to brushless recently and have run about 3 packs through it and I'm having some problems. So first off here are my specs

Monster gt locked in 2nd gear
Castle mmm esc
6s 40c 5000mah lipo
Hk kb45-10xl
20/54 gearing
Maxx mashers wheels (5.8"?)
I'm geared for about 30

I've peaked this motor a couple times at 200 while trying to play w/ the gearing, took it apart after the 1st run and found a broken peice of windig. Being new to brushless I cleaned it up and reassembled it. Now I took it apart 2 packs later and found more carnage! More broken windings. Tried a bunch of different gearing and tire sizes trying to bring my temps down but it seems every 10mins the motor hits 200f. So I'm wondering if I should try a lower kv motor? I've drilled the front and rear of the kb45 but I believe its too late now and I need a new motor