Dave,

I am literally in the exact same position as you - I am just completing my Dragonlady ARF I have an ASP 91. in mine, I have run it with out the wing on and I had hideous vibration, I thought I may have been doing some damage to the tail as it was shaking so bad. I have just this minute finished running the engine - with the wing on this time - it was a lot better - LOT Better, although I just tried another prop - thinking my 1st one might have been out of balance and I think it may be. Are you using the engine mounts provided?