I tied my d loop on using the Wildman 3 pack loop material. I used a needle nose between it and the string to stretch it tight as I could get it. I noticed that the loop was closing some so I tried to tighten it and it stayed a little while and moved again.
Last night I had someone tie in a peep and he took my loop off and tied in another using a new piece of loop material. His loop slipped farther and faster than mine. His opinion was this Wildman stuff isn't stiff enough but I don't know if I buy that. There are plenty of guys using just the loop with no tied or brass nocking points without slippage, my friend included.