awleder,
Try the pinch test and set the airbleed from what it tells you.

First off make sure the hole isn't gummed up.

To pinch test, first run the engine with the throttle open to clear out any excess fuel. Then let it idle about a minute. Adjust the TX setting to get your lowest idle before you do all this.

After it's run at it's lowest idle for about a minute, pinch the fuel deliver line completely. Stop the fuel flow.

If the engine speeds up just before dying, then it was running too rich. With an airbleed carb, to lean out the idle mixture you need more air going through the airbleed. Turn the airbleed screw to open the hole. repeat the test with the new setting.