I have never used a peep! I tried and hated it!!!
Here is what I do! I use a kisser button, and I put some serving, or dental floss on the string at the height of my eye, and put a little "White Out" on the serving! I use the edge ofmy string, and the white out as my rear sight!!
It also helps if you put just enough serving on as your going to put on"White Out"! That way even in low light conditions, you can still see the little bump on your string!! I shoot 4" groups out to 40 yds!!!