What you have said seems clear Paul, but what is causing it, less so.
You said several posts ago, that when you advance the speed control without applying choke, not only does it run badly, but it develops a wet spark plug and a wet air filter. Can you check if the plug and air filter are wet after you run it on the right amount of choke, then verify that it does those things consistently (in other words, run the test again with no choke, and with choke, and see if it always shows wet plug and filter with no choke, but not with the right amount of choke to make it run properly).
