I too am prone to gyno and have been using a maintenance dose of 10 mg of Tamoxifen (nolva) during cycle along with an AI and have been getting great results and zero gyno flare ups; 20 mg if I dose test more than 800 mg/week. Along with Aromasin at 25mg a day I've been getting great results, no gyno, skin tight dry vascularity, joints are fine. Mind the letro it can crash you Estrogen if you take too much. Hope my 2 cents help.