Hello TurboRT,
We are glad to have you join us here, but I don't think you will find much discussion regarding this facet of sport/experimental rocketry. It is just plain too dangerous, and too easy for people who don't understand what they are doing to get hurt.
TRF would be happy to help you with almost any other question. If you want to try a forum that deals with propellant formulations, you might try RocketryOnline; I think one of the forums at the bottom of their list deals with Experimental Rocketry.