Yeah - your testicles are running fat dumb and happy - but your pituitary is shudown from producing LH because your hypothalmus is sensing an overabundance of testosterone caused by the HCG.
Most guys don't worry about the pituitary - they're more concerned with their balls because they can SEE them and FEEL them and they don't like them getting small.
But you can have the testicles of Conan The Barbarian and you won't produce test unless your pituitary sends the LH signal to your balls. So - while on HCG - your pituitary is undergoing "atrophy" if you will. Maybe when you come off the HCG it will rebound no problem but - you were talking about going back on gear and so ... well that just means you'll be shutdown longer.
There is a lot of very bad advice on boards about HCG.
Your HPTA is shutdown - the only thing working in that loop are the testicles.