Actually, being more active is a sign of stress. I never see my bps during the day, unles it's feeding day of course. Even then i only see my large female because she is a pig, and can smell a mouse.

Is 84 your warm side, or ambient? That's too cold for the warm side, it needs to be 90-92. What are you using for substate (floor cover). I used to use aspen, and found it was blocking too much heat, so I switched to paper towels and that us much better.