If my memory serves me right you have a history of stay in Thailand. AFAIK, I hope you can proof me wrong the Consulate is nowadays very strict on persons that stayed more than 90 days in the past 6 month (they even consider stay Non Immigrants in that rule). When did you apply ?
get a Multiple Entry Tourist Visa (METV). The new passport not really help, doing a border run they will see that you did two run this year. He can also get a SETV, however no indication which country he is from.
we will announce two more trips in the near future. But in your case Savannakhet is OK, they will ask some question to ensure that you speak and understand Thai according to your level. Nowadays many people worry, but in many cases there is a story of being denied a visa. Last week we got a big complaint from a leading modeling agency why one of their models was denied in Savannakhet. I was shocked too, as paperwork was and still is correct. After checking we found out that it the persons 6th request for a Non B, back to back, had work permit, but did not extend inside at Immigration, just went every 3 month to a different Consulate.....
Valerio Morini on 2nd October last year Vientiane issued some notice re issue to ED, means actually a in a full year you can apply only once to a ED Visa. A copy is enclosed. AFAIK Duke is no problem, can apply anywhere, why not asked the school.
another problem that people tend not to read correctly. The news out of Vientiane was that it became difficult to obtain multiple Tourist Visa and some schools had issues with Non ED. Actually the biggest issue is the limitation of 200 people per day. The big Consulate is virtually empty.