there is no answer to this as it’s down to immigration to accept or decline your entry on the day. If they think you’re using tourist visas to stay here in Thailand, you will be spoken to and could be denied entry.
Your past history could be seen as abusing the system. As has always been said here, the granting of a visa does not guarantee entry to any country. It simply means you have been cleared for your visa application. On arrival, things can and will be flagged up on the IO system regarding your past entries. The visa you may or not may obtain before arrival is worthless. If you are asking for a sure fast way of entering Thailand with your past history, I would suggest get the visa. Try it. And if rejected then have plan B.
Hi Tod, is the documents required still the same as Vientiane? police back ground check, a medical certificate etc, For Chiang Mai? Thanks for your info on this