Most of the time, especially when trying to add size, I dont mind my estrogen slightly elevated. When Im cruising, I definitely want it in the normal range. I think Test:E2 ration can be just as important when trying to gain mass.
I have slight pre existing gyno, and as long as my nipples are not flaring up, and Im not bloating like crazy, I'm fine in a gain cycle. I was at 2g of a mixture of test and 500mg of tren for just a cpl of weeks as I transitioned from short esters to long esters. 25mg of aromasin a day and I dont even hold barely any water at that level. Now around 800mg of test, I still keep my aromasin at 25mg with no issues.