Balance the airplane at 25% mac. Truly, balance at the quarter chord and you just might be amazed. Most common mistake is to treat most cubs as though they were some sort of 3d flyer and balance them at one third or more. You will find in many forums that to balance just about anything at 28% or less preferably for intial test flights is not politically correct. But do so and you just might be fascinated how docile and pleasant flyer a cub can be.

John