Also:
ORIGINAL: haikt
i have cg at 12.5% from root
That's not back far enough.
ORIGINAL: haikt
the elevon reflex as i understand is the elevon offset to up 1/64 inch
That's not enough up reflex.
ORIGINAL: haikt
is it have to be taken out after the plane is going
The reflex must stay the same for all flight modes. The trick is to set the CG and reflex so the airplane is stable at any speed, flying just like an airplane with a standard tail.
HTH,
D