Clen isn't catabolic and doesn't effect AAS negatively.
I agree that if you're cutting, test alone would help hold the muscle while you diet. Masteron is a hardening drug that you won't appreciate until you're well below 10%.
Low bf% can be achieved without clen or T3 if you have your diet/cardio down. I don't use t3 at all and only add clen when Im approx 10% bf.