A lot of people like to think running HCG is gonna make you 'shut down less' which is quite a nonsensical term IMO. When you're shut down, you're shut down; doesn't matter whether you're on a TRT dose or you're blasting 15 grams of steroids but when you're down, you're down. HCG acts like an on switch for your balls - when you're off your cycle and PCTing you take it to switch things on again. I don't see the need to run HCG concurrent to the cycle.