You might want to recheck that the wings are properly installed and rigged, instructions int he blueprints, and I'm sure Roger at ZAC will help you if you didn't get the 'prints with the plane

Frank, check rigging first.  Next my issue was when I built it I did a difference of about 5MM on one wing.  Builder error.  I called Roger and he basically said fly the plane it will be fine.  I do have a very heavy left wing and first flight my arm hurt for days.   Checking rigging helped and after much research I found a video about heavy wings.  As our planes have a "radiused " trailing edge you need to lightly squeeze the trailing edge of the light wing.  Do a small amount at a time and test fly.  Took me two squeezes to make it right.  Now I can trim it hands off unless I fly with one tank near empty.  You are not flatting the trailing edge, just reducing the radius.  

Greetings Frank,

I also fly a CH601XL. It is hangared at KBRG (Belen). I would be interested in communicating with you on a variety of issues surrounding our planes. My email address is wolfcub1945@gmail.com/