Pls let me know your experience if you've done this since the general "crackdown."

I work part of year in HK in semi-retirement, and like to spend about six months of year just hanging out in Thailand, where I used to work. Last year I got a double-entry in HK, finished it up and returned to HK in September. I'm hoping to return to Thailand in December with another double-entry.

I hold both US and HK passports. Would HK passport be better? However, it has a fair number of tourist visas over past few years; US one is cleaner.

Thanks.

It will not matter which passport you use. Your old visas will mean nothing.

You can get another 2 entry visa but you will need to show a ticket out for each entry.