@Max *********
it is at the sole discretion of the Thai Immigration Officer you present to at the Immigration arrival hall.
You can be lucky or not, the IO can look at your passport and work out what you have been doing easy enough and decide to flag you and not allow you re-entry.
I personally was in Thailand 3 times last year, 1st time was for a month and left, came back mid year stayed for 6 weeks and then back end of year for 5 weeks, was mindful that I may have been pushing my chances, but then again I was not staying for maximum visa exempt period.