anyone had a K-80Ecompressor stall? (Im presuming thats whats happening based on a description of the sound from other threads - burping, fluttering, cavitation type sound) - mine does it at max rpm (not all the time - comes and goes, if I drop down a few thou - it stops) - otherwise starts and runs really well

also curious to know what RPMto run at for 13-14lbs thrust

thanks