I can't share experience with putting the RHP on the hot side and the probe on the cool because that is not how I do it. I have cold climate in the winter as well and what will work best for me might not be the popular way or work for you. Other people here have done that so they may be able to help you dial in the placement if you want to do the hot side RHP / cool side probe setup.
I placed my RHP in the front middle of the tank to give an all over raise in ambient temp and left the heat tape to create a floor hot spot. I have also placed rocks under the RHP to provide radiating heat back to the enclosure which while it is slight, does also help.
This allows the far side away from the under tank heat to gradually step down in temperature while still providing a cool side hide that is above the minimum recommended temperature levels. While the far right of the enclosure wall can get cool, the hide itself does not fall below 77 degrees. I still have yet to go through the coldest part of the year with this new herpstat so I have not figured the ideal winter setting and may need to up the temp setting but I don't feel I will need to by more than a half degree or so.
Edit: You have a herpstat 2 right? You need independent heat control and probes for the heat tape and RHP. You cannot adequately control both with a herpstat 1
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