Wrung the top off of one of the aluminum Torx socket head cap screws during final tightening. Lucky the material was aluminum. It was simple to extract the screw with an "easy-out". These really have to be only snug tight. I'd recommend nothing more than 1/8 turn after snug.

I did the same thing, last bolt and last little snug. Filled the hole with permatex and will replace all screws when covers start leaking again.