The old but tried and true test for proper cg.....

go 3/4 throttle... roll to inverted... establish 45 degree upline... take your hands of the sticks (neutralize the controls) see what she does

If she maintains the 45 degree upline.... cg is right on

Nose drops... she is nose heavy

Tail drops... she is tail heavy

That's all there is to it... hope that helps

SDS