Steve in my experience I take HCG (inj) 2xs per week @500u . I recall in my very first cycle I didnt take it while on and midway through it my left nut felt like someone put a damn vice grip on it! Rather painful. Since then I use the protocol above mentioned and I have no issues, remain full.
I've also talked to pros who say that taking HCG while on does not make a different as you are basically "shut down" so why take it. But then agian, there is no bloodwork to prove otherwise. I have not taken HCGenerate but have certainly read some very positive things about it (you were 1 of the posters regarding this).