Primo crushes my estrogen, not just masks symptoms. I didn't figure this out until a few years in. Just something to be aware. I kept blaming Aromasin and my shitty volumetric dosing. Then I blamed my shitty quartering of Arimidex tablets. Easy to crush, slow to recover.
Also, from what I've learned, which is minimal, it's about the ratio of Test to Estrogen. As Test rises, so should Estrogen. It is a probabalistic thing. Think about it in terms of the probability of Test versus Estrogen hitting a receptor. You can have high Test and high Estrogen but the same probability as lower Test as long as the ratio stays the same. Maybe this is all bullshit, and I'm sure it's an oversimplification. It's also TMI. I'm now asking why I even chose to write all that.