Taylor

Iam not certain but I have had a simular problen with a two stroke set up. I worked a whole seson with that problem.
I found out that the leaning comes from the tank. I used a clunk and a brass pipe internal in the tank. At closer inspection i found some
black spots along the pipe wich was a bad seam. As soon as I raised the nose on the plane the pipe was drawing air hence the lean motor.

My suggestion is that you check this if you are using a brass pipe in your tank. A quick test is to replace the pipe with fuel tube to check it out.

Hope this solve it!

Regards