Seems really odd that the chain is dropping between rings (is the inner ring installed backwards?). But I will add my voice to the chorus and say get a compact FD. I had a regular centaur 10 speed double on my bike with the correct FD and when I switched to compact I didn't even mess around I went down to the LBS and bought the century grey compact FD to match. Even still it doesn't shift great. I should actually try tweaking it before the next ride.