for 1900 baht you are safe to re-enter, well, for another 1000 baht then on top...
wonder why they don't include this in this 1 year extension, but hey, thailand is barely in the 20th century
or maybe 19th century mentality
I am also thinking in, not extending, visiting home or other countries and maybe come back a few times with the 60 days, not staying more than 180 days...