A good 750g male who eats a small offering between pairings should be able to handle 4-5 females.
We pair males probably different than most breeders. When we pair a nice sized healthy male who is eating he will see 3 females before he goes back in his tub for a rest and food offering. He may be cycled to those females for anywhere from 5-9 days depending if he locks and is done with each female quickly. We weigh before pairing, and after pairing. If weight maintains and he does not eat, he will be cycled again in a few weeks to some other females. If the male is not eating and dropping weight, he may not be paired till he eats. Generally after a shed a male will take an offering, so try that with borderline sized males. You'll be surprised that fresh water alone with a male who is not eating will help maintain his weight.... the same with big females who go off feed when building. I have had females gain 100+g without taking food for months.... they drink plenty of water.
You always need a back-up male in these cases if your 1st selected male for pairing is not up to the task. Do not underestimate the power of several males in your collection in these cases.
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