First of all, I am sure Fin will have this all covered upon his return. His customer service is always great
Second, you are a BIG rider.
Third, based on the wear marks where the core raises up in the bottom of the plate, I am cruious if you might have the 4X4 hardware in the wrong position. This would both limit the travel of the system, but also potentiall cause the smaller set of marks.
Any pictures of the board and plate set up from the side? showing the stack and alignment of everything?