Is it possible that you only checked your tire pressure after you rode to a store with a pump ?? You should only check cold pressure. A moto tire will change 4 or 5 pounds after you have been riding even a short distance.
I run a Bridgestone Driveguard 195/55/16 and have about 15,500 on so far and will make it to 22-24 k easy. Great for traction in rain or dry, high rated for hydroplaning. 30 lbs air when cold.