You will not need it. Mast is used for est control. 50mg every 3rd day is enough if you was to have problems, however you wouls have to be highly sensitive to est to suffer with it at those doses. I would suggest you read GH15's bible. It got everything in there for you. These you have been using is one of the compounds that converts directly into the most est. Tren does not convert directly, it can through a negative feed back loop but that is another storey.
It is persistance (regular use) with quality compounds, regular training and steady diet that produce gains. If you cycle steroids on/off your going to Yo-yo up and down with your water, fat and muscle mass as the body cannot maintain these states naturally once you get over your genetic limitations (natural).
Compounds that always need to be there to produce that hard, bodybulder look are Tren/Mast/Primo or all of these in specific combinations. These are what are used to get lean and take out water from between the skin and muscle. Proviron is used for water and weight control also but I do not have much exeriance using it for weight loss, just water control.
You always need test there to keep you functioning and feelin good. Now test converts to est so you will get water retention (faded lines to bloated) at higher doses. These doses depend on how your body responds to it. 250mg-350mg is a good starting point. I like Test Eth and Prop. Eth is more bang for buck in my opinion and I do not really notice any difference until higher doses are used. The good thing with Prop is it is in and out fast so easy to drop out if you get sides. If you wanna add size, bang the test up, this is best done from lean as you will still look good.
You have compounds the can be run in the back ground that add size. Deca/NPP/Bold. Now deca produces allot of water retention with me so I don't like to use it, however bold is a very steady builder, bult mild and NPP is nice as it gives the muscles fullness and again is a short ester.
You also can cycle to Test out from time to time and run orals. Two great things for filling out are D.Bol/Androl. Again best doing this when lean as you will bloat otherwise. Androl the best in my opinion, blows you up big and strong very quickly.
So the general idea is to use test always unless running the orals stated for a limited amount of time. Run something in the background like NPP or Bold for steady size and use compounds such as Tren/Mast/Primo or combinations of these for the look. It will take time, not going to come over night, you must be patient. You gradually take the doses up and if you take one thing out you take another thing up to keep the doseages in the same area. This will give you that roid look in time.
You can stack Test, Deca & D.bol etc and grow very big but you will be bloofy and not look good with a T-shirt. This good for raw size but not good for the look. With a very clean diet you can look good on this but never as good as you will when taking Tren/Mast/Primo.
Personally you want to stick to Tren as it more affordable than primo and as you up you doseage use mast for est control or along with tren to help with the granite look.