Most of what you are gaining is fluid(water retention). Primo and winny are both a 7 out of 10 for keeping gains, also know that they don't give great gains like anadrol because they are not high androgens and there is less water retention from them and more hard work and diet is needed. Some use to say the coming off with HCG would help keep gains from high test cycles. It has not yet been proven to me. I don't know anybody who does not loose gains when they come off. Even the pro's shrink.