The problem was the washers used were not large enough. I put a wood stripe across that section of the floor to spread the load. Drilled new holes and used longer bolts. Worked like a charm. HDPE would work as well if you have issues with the whole wood in a boat thing (understandable).
Previous: 1993 Prostar 205
Red 1998 Ski Nautique, PCM GT40, 310 hp, , Acme 4 blade, Perfect Pass SG/Zbox.
Be kind. Have fun.