I hope the pressure change cures the issue, but here's some food for thought. The right tire is very likely to wear more quickly than the left, all things being equal, because it travels further in turns and curves than the left tire (in countries where we drive on the right side of the road) due to the radius being greater. Just imagine turning left on a multi-lane divided highway vs. turning right at the same intersection, and you can see how dramatic the difference can be, and big sweepers can be even more extreme.