Estrogen is needed at small amounts to maintain libido, its the feel good hormorne, your libido drops while on Adex because you slammed it too low. Too low estro also hinders gains. Just keep tweaking the dose the find the sweet spot. Also everyone has a slightly different test/estro ratio so its not so much the level of estro (to point) that your looking at but rather the ratio between the two. 80 might be high for you but low for someone else.