I have lower SHGB , I find I don't do well with e2 under 40pg. So I don't think we can say that low SHGB needs lower E2. I got my current e2 level into the 60s and have great libido, mood, and function.You're one of the few people Ive seen or read that seems to understand E in the presence of Low SHBG values and the effects it can have on those guys. I for one test only Estradiol, Free, when I have labs. Its logical and plausible that in a low SHBG environment where Free T is very high on a lab test, that the E is equally unbound and FREE to act on the body's systems.