The hex wrench adjustments are either for the upper cuff adjustments if they're on the side, or for the screws in back that attach the upper cuff to the lower boot and affect flex of the boot. If your upper cuff isn't adjusted for your leg and foot inside the boot that could be causing some navicular pain (the 2nd ankle bone). Find a friend to help you, stand in the boot shell on your orthotics and see if your leg is closer to one side of the boot than the other. If that's the case, you can have someone tilt the upper cuff to match your leg more closely by loosening the hex bolts at the ankle and tilting the cuff - that's something that any of the ski shops should be able to help you with for little to no charge.