You hit the nail on the head. If you keep estrogen in check the acne will cease to exist or be minimal at best.
I used to have bad acne while on "cycle" before I got on HRT. The reason why was I never used an anti e. Never heard of it before HRT.
Once I got on HRt and an anti e like arimidex all of my acne issues were null. I have now been on HRT at 400mg/wk for almost 4 years and I have literally not had one breakout.
Estrogen control is the answer to most side affects associated with test use in my case.