wolfpack 

OK - here's my problem: I have a Rival compact double (50/34) with Rival FD/RD/brifters. I am trying to do stomps from 50/13 or 50/12 but when I attempt them in this gear combo, after approx. 2 pedal revolutions the chain will come off the big ring. I can do these stomps in 50/14 or higher, but I don't want to do them in an easier gear. I've taken the bike to the LBS and had the FD adjusted. The mechanic showed me that it had a slight bit of play in it and was possibly allowing the chain to come off under pressure.

Well, yea, it's still doing that. It will do it also when I am in 50/12-13 and going downhill. Do you guys have any suggestions as to what I could look at that might be causing this and a solution?

Thanks - wp.