Huh, did you install the panel before or after installing the ceiling of the cage? Could be a slight bit of sag in the cage top allowing a small gap on the non screw mounted sides of the RHP. It sounds like it has a bit of play in the screw mounts, I'd try making sure they're torqued down fairly tight before sanding on your nice new AP cage. Also I second Gio's suggestion to call AP. Ali is great to work with and probably has a good solution to the issue at hand.
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