deffinatly odd..i was having some serious engine tuning issues my self satruday...and one was with my extech .24 in my truggy and the other was witha O.S. speed engine in my buggy (so it didnt matter what motor it was)...It was like 90 and humid..and they were jsut flaming and running like crap (alot of other people had issues saturday too). .so i finnaly just cranked the high and low needles open to rich and worked em in a hair at a time .....after about 20 minutes both were running fine...

But it deffinatly sounds like you had a fat bottom end needle setting...if you let it sit for 10 seconds dose it take off smooth from a dead stop or blow out alot of smoke...you also said your extech was running around 200...thats aweful cool..mine runs 260-265 on trinity platinum still showing great signs of smoke at WOT..
Weather and humidity plays a big role with tiny 2 stroke motors