For me, it wasn't the jumping... it was the landing.Is it just with crazy jumping that you've had issues? What level jumping is that?
With bigger air, if you land nose heavy or rear heavy at all, it cracks them. If you lawn dart, just order the parts as you go pick it up because guaranteed you broke a bulkhead. I went through 8 or 9. That was in 35 bash sessions. Most of which after going with 6S... the first 5 were on 4S with the MMX6S/1515 in it.