I had the same problem. Obviously, because the seat tube angles away from the head tube, the more you pull your seat out from the seat tube, the further back your seat is going to go. I ended up buying frames that some would consider too big for me (I'm 6'1" and ride a 62cm Cross-Check and just bought a 61cm Lemond), but because I have long legs and a short torso, they actually fit me way better because I don't have to pull the seat out so far. I barely have clearance on the top tube, but I don't care. I've been riding bikes for a long time and I have honestly never in my life encountered a situation where I needed to stop and straddle the top tube REALLY FAST.