Pushing Coolant

[cman3000]

Well, when I first got my car, it was having overheating issues due to running lean. After I switched to over e85, I brought the car to DB to be tuned. The car was pushing coolant badly, so Alex(Iceminion) and I put a new headgasket in and brought it back. Car still pushed coolant, but not as much, and they were able to tune it up to 22psi.
Figuring it had a warped or cracked head, we took the head off last weekend and i brought it to John Gosh on Tuesday. He called me later that day and told me the head pressure tested fine and that it was not warped nearly enough to be casing a problem.
Needless to say, I am stumped. Cracked block? Is the head lifting under boost even though I have ARP's? Any help would be greatly appreciated.