Yeah exactly, all SERMS will lower IGF-1. Adex will improve IGF-1, not sure about aromasin. Personally, if you're running an AI, whatever you feel like you want adex or aromasin probably doesn't matter, through the cycle and after you won't get a rebound. If you do, then take an adex. Aromasin has big tablets at the very least so splitting a 25mg tab into quarters would be easy so that might be a better option. Adex you can only really halve as they are small and it's just 1mg, which is tiny
I would avoid SERMS entirely, personally.