Kris, even worse we were at 480#s with a torn spinny.
And yet you still beat me at 400#s and a non-torn spinny...
Here's my suggestion for how to affix the weight - go to West Marine and buy an anchor of the approximate weight needed. Get a line, tie one end to the anchor, the other to the crossbeam near the dolphin striker, then the toss the anchor into the water. It doesn't need to touch bottom.
