I think his problem is the ball is stopping on the approach shot. Maybe a little less b/s on the Clevelands? I haven't had mine long and am still getting used to the spin.
Oakmont is a real love/hate course, I just played the front 9 twice back to back. Once tourney greens, once very fast. Got a 29 and a 35, the good score being with tourney greens, go figure that one.