@Michael ********
In order to switch to 65,000 per month, you have to meet BOTH requirements for a year.
So say you want to switch to 65,000 for your 2nd extension (the first time it would be possible). You get your first 1-year extension with 800,000 in your Thai bank account. This first extension has the requirements that you keep 800,000 in your bank account for 3 months after you receive it, and your bank can never drop below 400,000. Those are the rules for that entire year of the extension. During this year, you would also be doing monthly transfers of 65,000 baht from overseas.
Then for year 2 extension, your bank statement needs to show that you met the previous rules, the 800k for 3 months, never below 400k. And you also have to be able to show 12 full months of 65k per month transfers.
Then once you get this year 2 extension based on monthly transfers, you can stop keeping your bank account at a minimum balance but must continue the monthly transfers moving forward.