Thanks so much, theprolo. I had perused that folder before, but didn't think any files there would be it. It is "thermalexpansion.cfg" in the folder he mentioned if anyone else comes looking for this. Also, I'm sure theprolo was going by memory, but it is C:/users/yourusername/appdata/roaming/.techniclauncher/tekkitlite/config/cofh. Close enough for me as I had spent a lot of time in there! Thanks again, prolo!
Oh, and for fellow n00bs like me, just type %appdata% to get to the roaming folder at the prompt.