i hear from a few Hiper owners that they all leak. something about thick tire beads do not sit well in the Hipers.
you will regret using silicone when you change tires. Figure out where and why its leaking first, remove the tire and rotate it 90* on the wheel. air it up to 15psi and use dish soap and water in a spray bottle to find it.all correct torque. I'm thinking might user a bit of silicone on the bead ring