If the tubs are free standing (ie. not in a rack) and your room is cool or drafty you are going to have a very difficult time getting the proper gradient. If they are in a rack and the room is below 70 degrees you are still going to have a hard time getting the right gradient. (I keep my snake room at 75 degees.) You may need to add a second strip of flexwatt. A lot of people frown on using it, but I like the 11" flexwatt on my larger tubs. Also you can meet the half way idea if you run 4" flex watt the full length of the longest part of the bottom of the tub or adding some side heat to the tub. You may need to look at something like that to cover half of the bottom of the whole tub. Also where is your temp probe for your T-stat and where are you taking measurement and with what? How many holes do you have in the tub and are they opposite the heat? Some pictures of the set up would probably help people better see where issues are and environmental conditions of the room the tubs are in would be nice as well.
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