I would do 500+ of mast. In my opinion it’s great even above 10 %. Everytime I used it when i was over 10% it was still worth it. For starters it amplifies effects of other compounds being used. Also it has great estrogen fighting attributes which tends to help counter sides of others being used. It might not give you that shrink wrap look it will at 5%, but ur muscles will still be hard as a rock. For me personally at least my shoulders arms back chest legs feel hard as boulders on mast regardless if I’m carrying some extra gut fat/water. Not to mention ur going to be on a 16 week cycle, which includes tren, so with proper diet and training your bound to lose some bf % throughout cycle. I see no reason why u cant get down to 9-12% after 16 weeks of this with your diet on point. I’ve ran very similar and had those results.
Also the mast is great for the wife if u know what I’m sayin lol. I dont personally have issues with ed on tren but I know some guys do.