TG's ground service at BKK is very good. Quite often they have staff waiting at the gate when planes arrive late to help in escorting passengers to their connecting flights. If your plane is late, talk to one of the FA's about the situation and ask if some TG staff can assist you in seeing that you make your connection. TG is well-known for holding up departing flights waiting for transit passengers who's incoming TG flights were delayed. I wouldn't worry about it.