No problem man.LOL, right on man... I literally just mentioned that study in another thread before reading your post. Great minds... BTW, I just heard it from Carl Lanore on Super Human Radio, so I didn't actually read the whole thing, so thanks for the link.
Actual study.
http://www.nejm.org/doi/full/10.1056/NEJMoa1206168
But that study uses the ultra sensitive e2 test so keep that in mind when quoting vs blood work as most people use the regular one. Which they will product different numbers. So this study hints at a higher number on a regular e2 test being good but there are other studies showing 20-30 good for regular too. Which the below links below reference (except the study above is mentioned below as well so keep that in mind)
http://www.renalandurologynews.com/hypogonadism/high-estradiol-boosts-libido-in-men-on-testosterone-therapy/article/335894/
(Have yet to find full text of above)
These studies are good too.
http://www.discountedlabs.com/blog/management-of-estradiol-in-men-what-do-studies-show/
Off topic but wanted to make the right info was given before I see misinformation popping up and things taken out of context and applied improperly.