I will test my settings and mods over the next 2 weeks. So far i'm running around with a test char and add mods to see if it is something mod specific.
Most of the different ini settings(enblocal skyrim skyrimprefs) where set to STEP recommendations.
Fraps/ENBoost show me ~60fps most of the time with a setup of STEP mods till enhanced night skyrim.
I experience some fps drops but they aren't heavy(goes down to ~35fps) but are short and the framerate raises too the normal value after a short time in this area.
VRAM is ~2gb and the enb menu also shows me that i have constantly over 900mb free VRAM.
So this may be already a hint to my drops as increasing mod number and some settings like ugridsToLoad can increase those stutters.
Before that i have tested a bit more with my full setup and those heavy fps drops don't necessarily come from turning around, as they stay if i look in specific regions(also i haven't noticed similarities to those regions).
So i can look in a direction and suddenly my fps drops till it goes to 1. If a turn away from those spots i get fps of 45+(full modded).
I may open another thread for my testing, but for now i will do some practical work with my InspectorStutter ;)