I'm interested in this too. I used to think I'm not a strong aromatizer, but my E2 reached 90 on 300mg test/week a little while back. Got oily and had a bit of upper body acne, but no other symptoms. Half tab of adex every 2 weeks cleared it up.
I've been as high as 500 test/400 deca with no AI, but had horrific bacne (and weiner issues) but no nip issues. No bloodwork back then, so no idea about numbers, but is there a good rule of thumb for when to start? For my winter bulk (test/deca/late dbol) I'm planning 1/2 tab a week starting week 3. Does this sound reasonable (not planning on bloods until week 5 out 6)?
Would love to hear opinions from the seasoned vets on this.