I don't center any of my pins in the peep. I center the housing and put my pin on my target (whichever pin it calls for).

I shoot 3D the same way I hunt. it's helped my scores TREMENDOUSLY.....and the advantage of low-light peep situations outweigh ......well....I honestly can't think of a "negative" to this practice.

I sight my bow in in this fashion. I could care less about "centering my pin" in my peep. It's unnecessary.