I have had an AP T8 for a few months now. I have a RHP from ProProducts (installed before AP delivered to me) and a vivarium VE-100 thermostat. At first, it was great, no issues. But recently, I have not been able to keep a good heart range. There is always only a 3-4 degree range. Meaning, right now, the warm side is 87 degrees and the cold side is 83 degrees. I prefer to keep each side a little warmer or a little cooler, respectively. I am not sure how to fix this. Anyone else run into this problem and have any luck with getting a better gradient? Thanks!