I have visited Thailand three times this year on visa exempt and visiting again 28th December. All my visits are two weeks at a time with a return ticket, my four visits will add up to 58 days in total. No way in the world they will restrict visitors like me, the two visa exempt rule per year is for people abusing the system trying to stay in Thailand long term without applying for a proper long term visa.
That 7 days only on second extension is very smart move by Thai immigration, basically it says you got enough time to pack your bags and leave Thailand
Return flight to your home country, staying, two three four weeks at a time staying at local hotels they will lay out the red carpet for you. Come and go as many times as you want.
Real tourists don’t stay 60 plus 30 days than try and do the same again by doing a border run. The two visa exemption a year is targeted at these people trying to live in Thailand without a proper visa, and after your first 30 days extension they will only give you 7 days extension and that’s to give you enough time to pack your bags and leave. Real tourists has nothing to worry, l visit four times a year two weeks at a time and will be visiting many years to come.
You are exactly the kind of person they are going after, you want to live in Thailand but don't want to apply for long term visa, person who is trying to spend 180 days in Thailand is not a tourist.