Some bad news..
It was a nice cool overcast day, so I did my testing outside, but noticed the tests weren't as clean as thry should be & slowly getting worse, when I looked at my GRS driver, I think the heat from the sun softened the diagram or the foil adhesive too much, shifting the traces away from the center...
It's leading to a lot of heavy distortion. Along with a loss in the upper mid range from 4K-10K.
So if you plan to do testing outside, keep it in the shade!
Even my Neo3 shows signs of the same problem, tho because it had far less testing its not nearly as bad of shape..
On the better hand, I did get some interesting results from using the plastic rods. Having 3 tall rods (as seen in 2nd pic) causes a MASSIVE hole in the response around 8K hz, it's caused by the outer two rods. However, the inner rod actually allows for a small 3-5db rise in the 18-20K Hz range, without the drop at 8K.