How about some bracing on that console ? Might consider coating the gunnel to the floor with some type of liner. I painted the interior of my Jon boat with a product called Grizzly Grip ( it's a non skid product) but it's kinda thick and definitely took some of the noise/vibration out of it too. If you go that route, go for the thicker/more viscous product. The thin stuff they sale may not help you that much.

You also could look at putting a piece of that board insulation between the console and the wall of the boat. That would probably be the cheapest.