Mike,
You've reach that point that every builder eventually comes to....... bending a barrel.
As the master Don Getz used to say..... ya gotta bend em straight.
My first Lehigh was the Busty Brunette bu Mr Allen Martin. It was just the opposite of yours, and shot about 4" low. I filed the front Patridge sight down as far as I could . I emailed Al, and my phone rang almost instantly, Allen screaming..... don't file that sight!!! What should I do?...... bend the barrel!
I did..... first try, shot to point of aim, and still does.