I feed on any day of the week, no set schedule, so feeding doesn't really impede on my breeding.
I feed the day after I pull them from breeding, then give them a day or two or three off and then off they go to another female.
My breeding schedule is dependent on their actions.
I don't just leave a male in with a female that's not being receptive, especially if that male is breeding 2-3 or more females, and even more especially if the male is young and small.
The 3 days in 3 out is a guideline and not something that should be strictly adhered to imo.