Your missing whats important. Instead of learning what supports them successfully, you want to prevent what they do naturally. What supports a small female, supports larger females. Instead, you want to practice what only supports larger females(more mass).

Education is to learn, husbandry is to support, in our case what they naturally do.

Your also neglecting phenotypic pressure. (selection factor) These animals have had thousands of years of perfecting the size they reproduce at. If it didn't work, they would not have the ability to do it, as those genes would have been selected against.
Nature is saying(by doing it) the 150grm. females are adults. You are being anthropromorphic and thinking of them as children. Nature does not play that game. They are sexually mature, or they are not. Its that simple.
I think its better to understand husbandry that works for all sizes of females. Cheers

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