I'll never go back to a "bungee cord peep", either.

If you're shooting with a D-loop, twisting of the peep should absolutely not be an issue: once the d-loop and peep orientation is set, put a dab of clear cement (I prefer "Barge Cement" from Ace Hardware, but any similar glue-type compound, maybe even Elmers? would work) on each knot of the loop with some carryover onto the bow string and the D-loop should never twist again.