Proviron is great addition to many cycles, its a strong binder to SHBG this will free up more of the testosterone so they can attack the AR. It can also can be used as a anti-estrogen but if you suffer greatly I would advice aromasin/a-dex but proviron can aid to reduce estrogen effects in many. I dont think you will experience any types of direct gains from proviron maybe a bit of hardening due to the anti-estrogen effects and obviously there will be more test floating around (due to its binding to SHBG)in its free state which will produce more gains from your testosterone. I think you could cut down your cycle, no need to run prop for 12 weeks IMHO i'd go with around 8 weeks its effects seem to come on a lot quicker than long ester which will results in shorter cycle.