I'm not sure where you did your research but Dr.Damkerng Pathomvanich at the DHT Clinic and Dr Kongkiat Laorwong at the Absolute Hair Clinic are generally recognized as the best HT surgeons in Bkk. Certainly they are the ones recommended on the major hair forums.
Dr.Damkerng is by far and away the most experienced surgeon and has personally trained many of the other HT surgeons operating in Asia.