What kind of speeds are you getting on the 14T? I was running a 16T (smallest I had) in the video, including tire ballooning that's geared for about 90 MPH on 6s

I ran it a fair bit like that and it ran just fine as long as I didn't run much longer than ~10 minutes, then as soon as I went down to a 14T and 4s I turned the ESC on and it started blowing smoke.