If you are still taking testosterone no matter the dose (even 50mg a week) then you are supplementing natural testosterone with an outside source which means SHUTDOWN, even if not complete shutdown you are hampering recouperation. Do not taper your doses, get on and get off, dont dick around
Tamoxifen (as citrate) is an anti estrogen to be taken if gyno symptoms show up or some people use it to help avoid water from excess estrogen conversion which makes people hold water. However as we all know the best mass gainers are aromitizing drugs, so if you dont want water then you give up strength and some size.
To block conversion you use an anti-aromatase, not anti-estrogen.
HCG can be used during the cycle to keep the testicles from atrophying from being emptied out by your horny self when the body is not filling it back up for you. This will greatly help speed recovery as well because a sac in full production is going to be better able to produce test on its own without an outside LH/FSH stimulator once you stop the cycle and once you stop your PCT which is going to help get your natural LH/FSH back on track. HMG is an FSH stimulator, but HCG (LH) with clomid works even on azoospermic patients very well when used appropriately.
Too much HCG in a short timespan will kill leydig cells so HCG must be used with caution, NOTHING comes for free folks. You dont start out with 4,000mg test a week and you dont use HCG in huge doses either.
See the post cycle thread sticky at the top if you want info on using it... It is not a post cycle drug by itself, it will continue to keep you shut down as you are replacing the bodies job with something external, LH suppression itself would be a bad thing but it is entirely possible. According to what I have read it is easier to shut down LH reception (by killing the leydig cells) than it is to shut down test, and test shutdown is piss easy, LH will also take longer to bounce back so again be carefull. Stick to standard protocols and you should be good to go.