The full throttle part was correct, unfortunately the really rich part is not good, nor was running it non-stop through the first tank. Run it full throttle at a rich TWO stroke setting (near the 2 - 4) break for 3-5 min, then shut down & let it cool. Repeat that process for the first tankfull. Continue the process slightly leaner, but not peaked, for a second tankfull & you should be good to go.

You may have hurt it a bit, but the GMS takes quite a bit of bashing to break it in.