Car losing power what could it be??

I put a new tranny in my car about 5-6 months ago with a Clutchmaster Stage 3 and now my car seems to be losing power at low RPMS the way it did when i need a clutch…

So today i Adjusted my clutch, first i tighten it to see if it would stop the slipping it made it even worst, so i loosen the clutch cable and the car now drives normal…What could be the problem??

I also let my clutch break in before i started driving hard on it…

Thanks Alot!

if it is a cable clutch, the cable might have stretched if so you will not be able to adjust it right.