Carb heat cold - landing checks? Where do you do yours. I wouldnt turn carb heat off on downwind when, in a complex plane, you do your ldg checks, check gear down and locked, adjsu props then reduce power, for which the carb heat should be on iff applicable. Then I put carb heats off on short final in anticipation of go around, whenI do my finals check, gear, flaps, props, etc before commitiing.
Anyway, hr building is only useful if you improve from it, so analyse each flight dont just perfect the easy bits...!