nice!
Mine oscillates into the 14's after being heat soaked as you describe. That's in cab so add another .5v at the battery poles ad previously described. I'm running a 170a Billet Tech, non adjustable and internal regulator.
Did u ever figure out your voltage issues?I sure hope we can figure this shit out soon. So far I've tried 3 ford alternators all new grounds and upgraded my alt to fuse box feed and today on the way home it stayed between 13.1 - 12.5 and when I cracked it it saw 11 and I wanted to drive it into the trees.