You did the best think IMHO. Trying to stop a .91 Saito at full bore is a BAD idea. I also think the "du-bro" fueler is a bad idea. There are just to many stories of these causing problems on glow engines. My advice would be to flip the carb over so you can get to the high speed needle. You are asking for trouble not being able to adjust it in the first place.

David