I agree with CBH on the temps.

Sounds like you are trying to keep these snakes with the "standard colubrid formula". I would read up on these snakes and ask questions to breeders (like you are doing). I think for these snakes and sandboas in general, there is a more optimum regimen for keeping and breeding them in terms of temps. 80 deg may not cut it for a gestating female. It might be OK simply to maintain a snake, but not to support successful baby production.