Bill,
I would still do some more looking into that. I have all of my Helix's set at 95, and most of my tub hot spots are 91-92 degrees. My concern with the t-stat sending a signal for 110, would be a malfunction, and the tape melting tubs (I have seen this before). Are you using 6 watt or 10 watt Flexwatt? Also, where is your probe located, and how is it attached? You should not need the t-stat set over 100 degrees ever in my opinion, and with an 80 degree ambient, it shouldn't be that hard to heat a tub.