Dom do you have access to set of depth mics? I thought I read on another post that your center is new. That makes it more difficult without the proper tools to measure pinion depth. I wish you were closer. I'd show you how to do it, or let you borrow the tools. If it was a used center ( a gear in it already) you could compare depth markings and do the math to shim the new set. I always use that as a guide then move pinion for a the best pattern I can get. Wish I could help more I feel like I owe you that