I got the extension you suggested, thank you.
I just want to report that, in addition to the documents listed on the website, Jomtien office wanted:
-Both Kor Ror 2 and Kor Ror 3 as proof of marriage (Kor Ror 2 requires a visit to local gov office in North Pattaya and 40 baht, took 40 mins there and back, but only 15 mins to do)
-They also wanted to see scans of landlords ID and house book.
Thanks again