Definitely get some dimmers. They are better than nothing. When I first started out I was using an uncontrolled ZooMed UTH and I found it running at about 105F. Here's what I suggest:

1) at least get some dimmers to control the UTH's.
2) Reduce the amount of substrate on the warm side.
3) place the probe of your AccuRite directly on the glass above UTH, and under the substrate. This will let you adjust the UTH with the dimmer to set the temp at about 92-93. It will be a little cooler on top of the substrate, but this will be the max temp that your snake will be exposed to if they push the substrate aside. Actually, since you are using a UTH on the cool side, you may need to reduce the substrate on that side as well...