We need a pic of the press mounted on the bench from the top side too. I cannot tell if you have only two mounting holes in the press or 4 or 6. My RCBS has 4.
It appears the issue isn't the press or the mounting screws, but the holes are too close to the 2x4 on the underside. The first thing I would do is take a dremel to a couple of washers and cut them flat on one side to clear the 2x4.