Joe,
After several start and stops with different holsters for steel challenge and my M&P pro 9L I ended up with this Blade Tech holster on a double alpha belt.
Blade-Tech DOH Dropped and Offset Holster Right Hand Smith & Wesson M&P Pro 9mm ASR Black
Product #: 246202
I am not sure what the inside of this holster is coated with but its very slick and allowed for desired cant. I went through both a Fobus and Blackhawk holster prior. I found I liked the blackhawk better than the Fobus after I deactivated the retention actuator on the Blackhawk but of course retention or total lack of made this setup undesireable.
The Blade tech solved my problems, it was a little more spendy but worthy every penny and wish I would of gotten here sooner with the Blade tech.
good luck