Doh!
Ok, try this...
Look at the picture. Don't measure it, just look at it. Now set up your elevator with the same deflection BY EYE. Set the rudder with a little more, and the aileron with a little less, then fly the plane. Get up good and high before trying anything like a roll or a loop. Land, and make whatever changes you want.
If you don't think you can do this, then you are not ready to "maiden flight" a plane and should have someone else fly it for you regardless of how it is set up.