Been stuffing around with a few different hitch cords just got a 3/8 red fleck beeline (hand spliced) been using it in a 5 wrap one braid and it bites every time and tends like silk 34" so there is a bit of sit back
Every time you tend your slack with a hitchclimber pulley there is a small amount of rope that pulls back through the pulley before the the prussic is pulled tight