You have your wires crossed on some bits
Just so you're clear
@Doug *****
you can apply for your year extension when you have 45 days or less left on your current stamp <-
That 15 working days before is ONLY for getting the initial 90 day Non-O visa (we tell people you need a minimum of 21 days left on your current entry stamp as it makes it easier 😛 )
So in your case IF you have the funds seasoned the 2 months that are required when you apply the earliest you can apply for the year extension on a Non-O visa expiring Nov 8th is any time after Sept 24th. 🙂
That is almost total b/s that they require the bank letter and the bank book update to match. 😡👎👎
There isn't ANY office I know that does that, the wording is BOTH balances have to be over 800K baht on the day you apply.