SARMS is what you need based on what your post said. You have ran natural test boosters, hesitant to take the next step, and want to run a mild steroid so there are no or low side effects. Sir, what you are looking for is SARMS (select androgen receptor modulators). They will help you put on good keepable size in a short time 4-8 pounds, help keep you lean or to lean out, and the side effects are very low.
Research S-4, MK-2866, and GW-501516
also, you should do as much research as possible before you step into this world.