Hi Hanora and welcome to SD.
This doesn't sound like a problem. Dime size is pretty small so they're only eating a little at a time. You're doing the right thing by cleaning up any they don't eat. You could just try feeding much less and see if they eat it all. Some may disagree, but I don't think you need to keep the temp that high. 82 is fine, although I guess I've read where some keep it higher to encourage higher metabolism and eating. I would just add that 50% daily wc is probably minimum, but again, OK if you keep it clean