Balancing my Stingray
Hello Claude.
I'm not sure about your questions, but in my country (Denmark) there are no dumb questions, only dumb answers.
You must be sure that the plane never gets tailheavy. It is better to be a bit noseheavy on takeoff. I have flown my Stingray with the CG 2 centimeters forward, and had no trouble with it.
The CG i meassured at the fuselage/wing joint