Though i'd share some photos for any other members who have one but haven't yet adapted it. Very easy fix.
I helped a friend move one last weekend, don't know if it was a summit but it certainly looked like one from your pictures. Have been in various similar seats over the years and they all seem to have the same issues. Get some 2x2 make three little oblong frames, screw the two side sections to the front and attach all round with a liberal amount of good quality zip ties to the original bar and that should cure it. That is if the shooting rail is up to that in the first place and not the flimsy bendy types.