The main issue is that not always turns but slides, it's due to low angle made by the dyneema and worst by steel sliders.
The main issue with pulley is sand. We wanted to use pulleys with steel balls but they work fine for a while.
Another option we are testing is a stainless steel pulley with central part in delrin for easy rotation.
Please note that harder you make the pulley (delrin+graphite) and faster you destroy the dyneema rope; the problem is not solved but moved to another part. Nevertheless we are trying to improve the pulley system.
I don't use the dyneema, I use the wave bar with my Jay and my GF uses the freeride bar