I've been playing a 3-4-3 with Heerenveen in the Dutch league for two seasons. I finished 8th and 6th (I think) and qualified for the UEFA Cup both times through the playoffs. I made it to the knockout stages of the UEFA Cup both seasons, and to the semifinals of the Dutch cup. Overall, the results have been alright, but not great. I've had a lot of trouble beating the top teams like PSV and Feyenoord. Anyway, my question is can I do any better using a 3-4-3, or is it a formation that won't allow more than moderate success?