Would using a SERM during a 3 week Superdrol cycle (10/20/20) help with recovery and what dosages ?
As I know people use HCG to help with recovery but I don't have a clue what it does (EG. act like a SERM ?) nor a source..

I wouldn't bother for a 3 week cycle of SD. If you're running 15 weeks of test and tren with a dbol kicker... now we are talking about on cycle use of a SERM or AI or hcg.
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I would pick up an AI if you don't know if you are gyno prone or not. Just like any cycle, make sure you have an AI and a SERM lined up before you cycle. Don't be one of the guys freaking out because they can't find a serm 2 days before they end the cycle!