I am suspicious that the orings are not sealing because of two grooves or divots that appear to have been created on the inside of the body itself, exactly where the orings sit when the valve is centered. This would create the leak out of the set screw.
I will get pictures of this tomorrow.
The valve and cup seal both appear fine, but I will try Jack's idea.
Otherwise, beyond the leak, the Invasion shot flawlessly tonight at the streetball event. Some efficiency loss from the leak, but nice and consistent with just a few breaks.