RP,
three things that might help:
- make sure your prop fits on the adaptor without any play. a loose prop is an unbalanced prop, and a badly unbalanced prop vibrates and breaks things.
- Prop saver bands should be hard to put on/take off. If it's easy to mount, it's too easy for the band to let the prop pull away. a weak band will give you a loose prop (see above)
- Balance your props. Dont' need a fancy rig to do it (though it helps), but it'll cut a LOT of your vibration issues out. you can get it close using the motor (watch your fingers!):
once you've got the prop on tight, slowly throttle up and see if it starts to vibrate. whirr is good, buzz is bad.
throttle back, get a small piece of packing tape and put it on the middle of one blade. Throttle up slowly and see if it's better (less/no buzz or get higher throttle before it does). depending on what happened, move the tape and repeat. If it gets worse, move the tape to the other blade. If better, but still not good, move it in or out along the blade. If you get to the end and it keeps gettign better, but not whirring at full throttle yet, switch to a bigger piece of tape (I've had to switch to aluminum tape once before, but that was a *really* badly ballanced prop).
when everythings on tight and balanced you should have a nice whirr at WOT. If you're still having troubles getting there, let us know.
BTW, welcome to the forum.