Another RV-6 with wood stiffeners... we run 45 -50 PSI and we have the leak-proof inner tubes. We need to add air about every year or so. Main gear shimmy at the end of the landing roll is ever-present, but pressure does not seem to matter. Tire pressure is shockingly non-critical for most light planes. Actually, I like it on the high side because it's easier to push the airplane uphill into our hangar....
What are you using for tire pressures on the RV-3?