Sloped Ceiling Canopy Kit

I am a licensed electrical contractor, I've put up a few fans. This item was reasonably user friendly but not entirely engineered perfectly for all applications. As you can see from the photo's, the mounting slots are placed every 90 degrees and regular holes which I predominantly never use also at every 90 degrees, 45 degrees off from the slots. The difficulty as always is the interface between the mounting plate and the existing ceiling box. The screw holes in the ceiling box are alway diametrically opposed, at 180 degres from one another. With fan boxes, it is particularly important to use the existing screw holes and bolts due to weight ratings and potential repetitive movement over long periods of time. If the ceiling box is not mounted with screw holes at an exact 45 degree increment from the line of the pitch of the ceiling, the slot and "tooth" that are intended to engage between the ball and canopy of the kit will not sit at either the top or the bottom of the assembly causing the articulation of the drop rod to be out of alignment with the vertical aspect of the pitch of the ceiling. Does that make sense? I assume the alignment tooth and groove are intended to prevent the ball from rotating in the socket, potentially twisting the wires inside the canopy. Maybe a sort of collet could be engineered for the tooth to allow it to be rotated within the canopy and locked into place with a setscrew at any angle allowing infinite adjustment. I know nothing is perfect and every feature costs money. Maybe just a few more screw locations on the base plate so the canopy could be clocked in different increments? I know, let it go, it's 16' up in the air.