So, we took another stab at it today. Working with the 90mm Fuji f8, we removed the lens from the cone and started over. Made sure the lens was mounted firmly and properly.

Then, we loosened the large helical retaining ring and completely unscrewed the helical focusing thingie. We then screwed the helical back in the minimum that is needed to keep it attached. This still wasn't far enough out - I had to focus the helical to 3 meters in order to get enough distance to get it focused at infinity.

Now, this lens is listed on the compatibility chart. It should work.

Is there another adjustment I'm missing to move everything out another 1/4" or so?

I attached a photo of the camera as configured to focus at infinity.