RE: How to determine CG ??
A suggestion while you've got the sucker on the balance tool..........................
When you have the suggested CG range to go on, you can use that info to help you out later on. See what it takes to balance the plane where the mfg's forward CG is. See what it takes to balance on the mfg's rearmost CG. Then balance wherever you want to maiden and do what you do normally.
When you maiden it, if it's sluggish on the elevator or flies nose heavy to you, you'll already know what it's going to take to move the CG back, and how far you can go safely aft with the CG. etc