Recently Bart Sauter an Billy Stevens have returned to leather bags and baby powder (sure on the first, pretty sure on the second). There are others who favor bags that are as slick as possible. What short of shooting are you doing, and what shooting style are you using? IMO the most important thing is having consistent release. There have been times when slicker did not shoot better for me, so I stopped chasing that, and have concentrated on consistency. IMO some stock designs do not take maximum slick as well as others. It is a matter of geometry and balance. The newer wood and carbon fiber stocks seem to be shaped better for free and slick. Mine is more of a vintage design.