I fixed the heat issue with Soulmates mod. Did you know that when hooking into a function with Harmony, the postfix function receives arguments modified by the original function, and not the original values? I didn't. It subtracted a super large value from heat's decrement variable, so it would take hours to wear off.
Also, now soulmate's nick is colored green.

Soulmates mod has been tested and seems to be fully working. Enjoy. I'll probably host a game tomorrow.