Carb heat off in the before stall checklist, with carb heat on it won't give you full pwr to recover, and in the short period in which you do the stall practise you won't get ice build-up (unless you are flying a pa32-260 that builds ice within a few minutes even when its 20 degrees outside!). On short final I normally put the carb heat off at 200 feet or something, again depending on type and conditions. But it should always be off when making a go-around, especially on hot humid days!
just my 2 cents............