No worries about nationality, they just want to see sound finances and if you can sustain yourself. I believe some iraqi and syrian nationals have posted on this group before about approval, try using the search function.
Just highlight the exact transaction relating to each payslip and write cover letter explaining the prevalent exchange rate and whatever flat rate fees your bank charges for receiving.
It's a request to check authenticity, because they didnt understand whatever documents you've sent, not a math test or tax audit.
The three month rule change seems to be fairly new, based on posts in this group, I would recommend rectifying with the issuing consulate by phone or email rather than rely on fb comments.
You can open a company with a thai partner and be a share holder/ board member. But being under dtv means you can not legally pay yourself a salary. It might be a better option to consider applying for a wp/non-b visa based on the company.