Alright... I did the chuck-glide tests.
It actually didn't need any adjustments CG wise... I was not expecting that.
I did a longer distance toss after the one in the video and it flew straight and level, it seemed to prefer the faster toss, not surprising.
I was pleasantly surprised at how well it flew "out of the box".
Next I'll be making a few modifications to the design to make it easier to build and printing the new plans to build the powered prototype.
If that goes well, I'll release the plans.