I've never had that problem, but I've played with my set up a lot. The reach from saddle to h'bars, the tilt of the saddle, the saddle itself, the height of the saddle could all be conspiring against you.
I've found the less between me & the bottom of the saddle, the better. No foam, but no carbon either. A hammock type saddle, usually leather (think Brooks) works well because there's little friction, but the saddle still gives (because it's leather).
Tilt matters as well, but everyone is different on what works. Make sure, though, that the nose of the saddle isn't tilted down, pushing you forward.