67 mustang brake help?

[dragula67]

HELP! Just put new granada disc brakes and new disc drum master cyl with prop valve in rear line as well as line lock in front lines I bled all lines and master cyl properly and I'm still not getting the best braking that I feel it should be? proportioning valve setting? Also when at the track setting line lock brakes hold but quickly tires start to roll after starting to heat tires they don't roll freely but don't hold like they should.I installed line lock per moroso instructions. HELP!