Tessex,

Yes, I give it down elevator. It just seems when I roll, it takes more down elevator (pretty much full down) to keep it from diving than when I simply fly inverted. It makes sense what you say about the rudder input. Of course, the rudder on the Tiger doesn't work that good and I'm not that coordinted.

I could be wrong about the aileron differential. I thought I had read somewhere that this tendency to dive in a roll could be caused by too much deflection in one aileron vs. the other. Now I can't find where I had read it.