first things first.. it early dont worry so much.
2nd, bumps temps to normal during the day and only drop a few degrees at night ...if you want to ..
i dont mess with temps at all. i keep temps the same and feed the same size year round.
when they are ready they will go.
you didnt say how big your males are or how old. just because they have plugs doesnt mean they are mature enough to want to mate. i have 2 males right now that have been producing plugs for months that are showing no interest at all. then my older experienced males are tearing it up with the lady's
adam jeffery