Originally Posted by
woodburner
"I popped out the control horns and moved them over one tick on the servo, so that the trailing edge was level with the back of the upper part of the stab..."
Do you mean you set the elevator in a slightly UP position?
Yes, the middle or bottom of the trailing edge of the control surface should be level with the upper trailing edge of the stab.
In other words the elevator should be UP about six to seven millimeters.
Also remember that the stance of the plane is important.