How much test? How much Tren? Generally guys sensitive to Tren sides will only run TRT test with Tren. You need to have experience with these compounds so you know what to expect. So before you run Tren for first time you should already know how much(if any) AI you need to keep e2 where you want it. Once you know how to control e2 from test aromatisation then you can add Tren and caber to lower prolactin. You'll want to do regular bloodwork so you actually know what your levels are.
E2 - monitor bloods and find out how much AI you need to control
PRL - monitor bloods and adjust cabergoline accordingly.
Nope. I carefully monitor my levels and know how much AI I need to control E2 and how much Cabergoline I need to control PRL.
Your E2 / PRL levels need to be monitored otherwise it's all guesswork. Are you using Tren Ace? Half-life of Ace allows you to drop it and be clear of symptoms in a few days but you shouldn't have to do this if you go about things properly with regular bloodwork.