My hot side is still sitting around 88. I know there is probably already a thread on this, but is there a particular reason for you not preferring back heat? For me it was a matter of being the easiest method to set up in the rack I built.
Bc you have to set the tstat higher. Running the flexwatt hotter and alot more heat probably gets wasted. And i feel like itd be harder to keep a hotspot with backheat too.