Other opinions may vary, but I would hold off until it's covered. I had the same idea and balanced my EasySport before covering and added about half an ounce in the very back to get at the CG. After covering, I balanced again and had to add an ounce and a half to the cheeks to counter the weight which was now buried in the frame. It seems that that the covering adds more weight behind the CG than in front of it.