And what height are you? If you are below, say 6'2", you are enormously muscular and it would surprise me you ask such a question about training with that kind of experience to build your physique.
I have not known of one pro who uses HST. I remember Boris Klein used it with a six day per week plan.
There are variations of HST for beginners, intermediates and advanced people. Some of the advanced I've seen train six days per week, hitting everything 2 to 3 times per week.
Would you be better off with push/pull/legs--there's no way to tell. Great bodies have been built with full body routines, HST, HIT, 5 x 5, bro splits, and so on. With your advancement, I am surprised you ask.