There are two versions of the ride plate. A long version and a short version. Many 800 models came with a short ride plate, and so did some 1200s. You need the longer plate.
Then, it needs to be set up properly.
Get a handful of stainless washers, the thick type are better to work with. Add a few to the front between plate and hull to lower front of plate until it is sticking out 1/8″+ (this means the water flowing down the keel will hit a lip in the front of the rider plate – this causes turbulence and increases speed and stability).
On the back of the ride plate, add shims +1 or +2 compared to the front (if you put 2 in front, start with 3 or 4 in the back). From this point, you can tune the ride with the rear shims. This baseline setup works for most people,
You can decrease bounce by adding more shims (up until the point where it doesn’t bounce at all, but then it rides nose down and loses speed). Or you can increase bounce and increase speed by taking out shims in the back. There is a sweet spot where it bounces a little at 3/4 speed, but almost none at full speed.
As always, give me a call at the shop for any questions you may have or to order your ride plate.