I am using this pan.
http://www.champpans.com/products/p/cp60lt/ Before I had one of the Stef's aluminum pans but oil control was worse.
I am surprised you would hit with a 3 3/4 stroke. I use the one piece gasket but even without it I don't hit. I have used this pan with a set of import H-beams rods and now with Callies H-beams, no problem either way. I think you are really going to have to find out exactly where it is hitting and go from there. I would suggest dykem on the inside to see where it rubs. Just my 2¢
Curtis