From my own experience I will say HCG post cycle is always a good idea. Don't worry about the atrophy while on cycle, it really doesn't matter and even if you took hcg during cycle and your testis were of normal size that's all it is doing for you. I'm on TRT these days and mine are quite a bit smaller than normal but I just don't care.
I suggest starting the HCG the last day of aas. Run 1000iu ED for ten days. Make sure you are running an AI when running the HCG as it will spike estrogen. I would stay on the AI a couple weeks into pct. Start your pct the day after you end HCG. The HCG will stimulate HTPA and help get your natural test production going quicker.
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Disclaimer: The advice I provide is based on experience and/or research and should not be considered professional medical advice. It is best to confirm any potential use of a drug or possible medical condition with a licensed doctor.