Your temps are perfect. High 70s to low 80's is perfect! And don't separate them. No need to, you'll end up doing more harm than good. Even the bad ones, just leave them be. They won't affect the healthy ones. Everything you have set up looks dead on, I wouldn't futz with any of it. Congrats!

At the temps you have I'd expect eggs in 65-75 days. Maybe a little sooner, maybe a little later. Mine usually hatch in ~65 days at those temps, though one clutch went to day 82 last year.