i think the key to keeping aromatization low is by not raising your testosterone over a certain level while it's peaking
i did 10mg prop, IM, ED, just because i had prop lying around, my estrogen was 55pmol/L
i think because my test levels didn't get too high, i didn't aromatize much
here a study comparing different testosterone doses and effect on estrogen and dht levels with different age groups.
It shows when injecting 25mg, 50mg, the estrogen levels don't differ much but 125mg caused estrogen to increase significantly more. This was once a week dosing with test
It also seems the older you get, the more you aromatize and it's quite significant, almost double the amount (once testosterone dosages are high enough). However the difference wasn't very noticeable in the 25mg/50mg group, so maybe keeping testosterone levels in range could prevent this.
https://academic.oup.com/jcem/article/95/8/3955/2597323