Steve,
I just checked and yes, my Kougar weighs in at exactly 6 pounds. As I remember, most Kougars were a bit on the heave side. I amazes me that you were able to bring in your Kougar under 5 pounds. My hat is off to you and your building skills.

To get back to the original question, my only recommendation for the ailerons is to make sure that you use enough hinges. Use as least four if not five hinges per aileron. I had problems with flutter with mine because the wood used in the ailerons was a little too soft for the number of hinges that I was using. I had to remove the first set of ailerons and replace them with ailerons made from harder wood and add more hinges (aileron augmentation, larger and firmer).