An AI will have no impact on hairloss.
HCG use should be determined by the length of time you are shut down. 12 weeks a while. Id recommend it. But Id also recommend a shorter cycle, with a higher dose. Almost guarenteed that a 8 week cycle of 600-700mg/wk will yield better results with a negligible increase in side effects (since you have the AI) compared to 350mg/wk for 12 weeks. Ultimately, that is your choice, of course. Its a difference between good vs better, IMO.
Especially if you plan to do multiple cycles, short cycles are more productive. That is if you plan to stay off for around the same amount of time as youre on.
Nolvadex is fine for PCT.