What additional steps strengthened your DTV visa application for Thailand?

Just got my DTV approved. Despite what I imagine was a somewhat unusual situation (applying from Brazil as a US citizen with a Hong Kong permanent address and a Hong Kong joint bank account listing my partner's name alongside mine), I was approved without a request for additional documents. I applied via the soft power route and was approved in 8 working days.

I have no idea whether any of this helped, but here's what I did beyond the minimum requirements to strengthen my application:

* I signed up for a 9-month course with Fitfac Muaythai in Bangkok. They're not the cheapest, but they were very responsive (even over the weekend) and I suspect having the documentation indicate a 9-month course would add credibility and make it easier to extend the DTV in 6 months.

* I applied using bank statements from a joint account that had over twice the minimum balance (i.e. one million THB). I figured if there were any questions about using a joint account, I would be able to argue that I was legally entitled to the minimum funds required for the DTV, even if half of my bank balance were considered to belong to my partner.

* I detailed my recent visa and travel history to Thailand (dates, ports of entry, visa number and work permit number, etc). The purpose of this was to build trust by demonstrating that I've always played by the rules during my time in Thailand.

* I wrote a detailed cover letter explaining all of the above, why I was applying from Brazil, and my interest in the DTV. I tried to anticipate and address any questions. I attached the letter to the course registration documents provided by Fitfac.

* I dressed professionally for the photo and used formal language and formatting in the cover letter. The goal here was to make myself look as bland and predictable as possible.

Hope this helps. Good luck to all who are applying!