The problem with Arimistane is there is very little literature (if any) on it that gives indication to how much of an E suppressor it is when it comes down to the figures - unless of course you stay consistent with the dosing and get before and after bloods.
Also be wary with playing with your E if you dont know what your natural E before finasteride was. My E before finasteride is actually incredibly low - which is just my natural homeostasis. On finasteride im still within range (mid-upper) however im 68% up from before finasteride and only 20% up on my T. Crashing your E below what your body considers normal is never the goal - but rather to sit on what your body considers normal.
Definitely dont use aromasin because it has a very androgenic metabolite that will make you shed like crazy.