There is a 1/16" factory drilled hole drilled through the bottom of each boom which denotes the CG position. The holes are present on the XL and the Standard versions..
With the landing gear down, full UAT, empty fuel tanks, the model should balance at that spot. The nose can drop very slightly at that position. (This is from the manual).
When you find the holes, install a #2 button head cap screw in each hole so you can find the CG easier next time.
This is a good starting point