Unfortunately you've missed the window of engagement. You should have started the 65k transfers one month before your extension application, which means when the next application goes in, you already have 12 x 65k to show. Don't miss it this year!
Good for you! Not everyone lives 10 minutes from an immigration office. I've never had a problem with the app, but there again, I enter the information correctly!
Perhaps the president of the tourism association should be talking to Bangkok Airways who hold the flight monopoly for Samui about dropping their prices, and maybe getting the immigration office to make an extension of stay a 15-minute process (which in reality that's all it is). Then there would be no need to change anything. Just another pie-in-sky dream