i have a 14" depron rigger and run a 30A esc with a 3s lipo 20C rating. the motor is a 400df brushless pushing a 32mm de-tongued prop. handles well so far, i have had a smaller C rating batt in there & it couldn't hold max RPM for more than a few seconds before the prop dropped off RPM noticeably. i upped the C rating and it now holds RPM well, but that isn't the problem you had (reverse). this is in a 13 ounce rigger. so far i have been doing runs of about 2 - 3 minutes then bringing it in as i've just started setting it up, and temps have all been cool so far.

not sure if this helps, but i hope it does.