I've also been having a similar issue and assumed it was the maxprop not opening all the way but I'm not 100% sure. The vibration happens sometimes when decreasing throttle as well. I havent found a method that always works for getting it back to running smoothly. I usually bring it back down to idle or even a boost of throttle helps. I know my prop needs refurbishing so I was thinking it was that and also some greasing. I'm also getting some nasty sounds in forward idle. At 1k it sounds smooth.
Rockland Bazemore S/V Blue Pearl C&C 37/40+ Port Washington, NY
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