I grinded the springs using a table grinder, 3/4 dowel, and 3/4 inch PVC pipe. I ended up taking about 20% off. I weigh about 150 pounds and that seems to work good for me. It helps to hold the PVC pieces loosely against the springs so that the spring spins pretty rapidly while the grinder shaves off the metal. My board carves awesome now without needing bindings!
Here’s a video showing what I did:
