thank you. you understand exactly. I used to do that but last 2 times they asked for my last boarding pass and would not let me go they have a list of about 5 airlines which are permitted to do this.
I entered 8-9 times last year visa exempt. I never stayed more than 30 days with 10-14 day breaks in between. I was never asked anything. I think if you don’t extensions and take breaks they will be fine