Well, if you have access to real primo, you should really consider taking some. The stuff is so good because it promotes good anabolism and strenghens immune system with very low side effects.
By the way, Methenolone is not a DHT derivative. It is a DHB derivative. Which is very different in a lot of ways. First of all on hair loss. Primo is not very harsh on the hair line has often said. It is rather mild. It has some effects but to a really low extent. Primo is a better drug than Deca as far I'm concerned. Primo is less potent but doesn't aromatize, doesn't shut you down hard and etc. Overall, if price is not a factor, as it should be with gear, primobolan is one of the best drug arround.
You could also drop some dbol. Somewhere from 15mg to 35mg ED. My guess is that 20mg to 25mg ED of methandrostenolone is enough for you and will likely not cause too much estradiol mediated side effects.
Dianabol is working so well with primobolan, it's not even funny. Since dbol is not a such powerful AR binder, and is yet so powerful, it means it has a lot of non-AR effects on the human body. In fact it elevates IGF-1, increase glucogenisis and protein synthesis (via both IGF-1 and non-IGF-1 pathways).
So if you eat well, with this cycle, you can't go wrong. Strenght gains, pure mass gains, and keepable gains. All this with minimum endogenous testestorone suppression, androgenic related side effects and water retention (since you keep the dbol at low dose).
You can also drop low dose test prop.