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I've been trying to get my Crossfire off the ground with the MultiWii, too. I'm having a similar problem to the one you describe. I think, but have not confirmed, that a frame flexible mode is coupling back into the rate gyros on the MW board. What I discovered, so far, (and the jury is still out on this), is that smaller props help. I was using those "bendy" 10 x 4.5 electric flight props for initial testing but discovered that the shorter 8 x 4.5 electric flight props are a bit better. Doesn't help endurance much but I think it helps quiet things down a bit. I suspect moving to large, carbon props will chase this problem away. But, I haven't finished all of my initial flight testing yet. Will update this as I go.