Kenny,
I did go through a transition vibration at one point, didn't hit the wood but made a god offal noise. Most of this was the bearings going bad in my AXI 2826/10 motor, once replace it was much better but still a little. Once I added the rear bearing its all gone. One thing you will likely notice is how solid the ship will feel with the rear bearing through all the maneuvers, this was something I was a little surprised at, Didn't think the motor was moving as much as it was. Let us know your experience.
Tomorrow I will try to compare the pusher vs. tractor props, should be interesting.
Best, DennisT