Don't believe the traditionalist people who say rim brakes work fine and that's all you need. Sure they work but not as good as disc brakes that just have more power with better feel, full stop.

Mt pug had Tectro V brakes that worked excellent but I took them off for canti's coz they look better, still work great but more work setting them up. Have you tried Coolstop pads with a bit of toe in at the leading edge, are your rims true ? Setup is learned through trial and error, maybe your still trialing Still disc's are forward thinking for the future.