Re: peep for TC hawken...
Yeah....one of the nicest benefits of the tang mounted peep sight is it blocks your view of the flash pan. So if you have a tendency to flinch (which I do....or did) the peep sight may help you with that.
As far as the aperature size, I use the larger one. I find it easier to pick up the front sight and also the target. The front sight centers "naturally" in the rear peep.
Practice with it, and I'm sure you will like it.
“Nothing external to you has any power over you.” -Emerson