I agree with Annarose, I don't understand your temps after reading your post. I used to keep my BPs at 90 and had some produce slugs. After researching, I lowered my hot spot to 87 -88 and no more slugs. The ambient temps in my room stay around 75 degrees. The room is temperature and humidity controlled. I do not night drop. My opinion is that it leaves the snakes open for RIs, but some people do it. I'd rather have a steady temperature than one that goes up and down. I do have a cooling period where I drop the temps a few degrees (October through February). The temps go down and stay there, no fluctuations (I drop the temps gradually and raise them slowly).
You said that one of your males is producing sperm plugs. You might want to take some of those plugs and wipe them on the back of a female that is in with a different male. Sometimes that will stimulate the males to breed. If you are not seeing locks, then something may be wrong with the setup. Use a temp gun to verify the temperatures. Rotate the males through for three or four days, then give them a break for a few days. Once they get the hang of it, you'll see locks frequently. Also, I find I get locks quicker if I pop the male before putting him in with the female.
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