I'm kinda surprised no one's brought this up before page 6... Tren can not aromatize at any dose. Using an anti-estrogen or an anti-aromatase is pointless unless your gyno is being triggered by something else in your cycle that does. Tren causes gyno through imbalance in Prolactin, this is sometimes seen in children who have a pituitary imbalance. The correct treatment is a prolactin blocker like Cabaser or better yet Dostinex. The doses are miniscule and rectify the nipple soreness fast.
That said, I've only experienced sore nipples with Tren twice out of about 7 cycles. The first time I was lucky to have Dostinex on hand, but the second time around, as it had been years of no issues, I was caught with my pants down and no quick source. A bit of research pointed me to vitamin B6 as an effective way to manage prolactin. I took 750mg twice a day for a week. Nipple soreness gone. Now, all I had was soreness, I never got grapes growing under my nipples... But if you're stuck in a corner growing tits, it's worth a try.