Right sorry. Thats the FPS I get just wandering around the Riverwood area. Before I installed STEP I was getting 50fps constantly. As for utilities I use Mod Organizer, BOSS, Fraps, and the Nvidia Inspector. I am running Boss as an executable through MO. I installed the mods in the order that STEP called for though I fear I may have went a bit overboard and might be using too many. =( I wasn't getting this problem until the end of STEP (I tested every so often).
As for non-STEP mods I have:
Sexy Whiterun (and all the other sexy cities by the same author)
Alternate Start: Live another Life
Claralux to replace Lanterns of Skyrim
Realistic Lighting with Customization to replace Climates of Tamriel