The problem is called Tillotsen. When it goes awy so will the problem. There's just no nice fuzzy way to say it other than directly.

What you are experiencing has been a frequent and long standing issue with the Tillotsen carbs. Some people never encounter it, others can't get away from it. Those that have made the change to another carb have always been pleased they did. The other issue with the Tillotsens is that it's not a "one time" adjustment carburator. More often than not, the carb will need to be adjusted for every flight. At least that's been my experience with a whole lot of 3W engines using a Tillotsen.