You aren't raising your natty test. HCG mimics LH, through similar albeit different molecular pathways to keep the leydig cells functioning so when LH is present the cells will function normally.
You should also realize that clomid has valuable spermatogenetic properties. It's not just a SERM with estrogenic and anti-estrogenic properties. Clomid is commonly used as a fertility drug because it induces spermatogenesis.