I was using a tube type on my 31" a to a and the part that the tubing slips over on the peep protruded down into your view through the peep. It covered like the top 1/3 of the "circle" you see through.
I switched to the Shurz-a-peep 2x2 and I'm completely satisfied with it. The hole is actually taper cut so that your view should be fine reguardless of your string angle. This is one in large or hunter size. I'm changing it out for a small one for non-hunting season shooting and I don't forsee any problems. If I have any, I'll be sure to share them here.