This bike is notorious for being extremely sensitive to tire inflation - and hard on tires in general.
I just turned over 20000 miles and am installing my 5th rear and 4th front this weekend. As an aside... this is nuts!
I would agree that it appears you need more air, based upon the wear pattern.
Another couple options may be:
1) Your traffic patterns? Left hand turns are always longer than right hand turns, hence, over time, you get more wear on the left.
2) if the road crowns on your daily routes are greater than usual, this will also wear out the left side first.
As far as under-inflation, while the pic below is car based, it is still valid.
Underinflation always wears out the edges first, and the center last. I find it amazing that your tire center looks so good.
With proper inflation (or over-inflation) , the center will always wear out first.
The only time this in invalid is if you play Ricky Racer at high cornering speeds, taking out the edges first. In reality, this bike grounds too easily to be playing Ricky Racer to that degree.
Many - if not most - folks on this forum - and the other - run at higher than Honda recommendations.
Another thing to check may be to verify the accuracy of your tire gauge. I bought a Motion Pro "Pro" Tire Gauge from Revzilla a few years ago; at $75 not cheap. But a superb investment if you do your own stuff. It seems no matter who does work on my stuff - from the Jeep Dealer for our cars to the local oil change shop to about 3 dealers in town I trust to change my moto tires, I almost NEVER find the tires match my own gauge. It seems slightly more are low reading than high - but not by much. It is ...interesting... that almost everybody puts all their faith in $1.99 or even free promotional Chinese air pressure gauges. After I bought it, and primarily to shut-up the wife
, (you spent $75 on a tire gauge???), I purchased three of the $1.00 special gauges at my local O'Reillys. None matched mine, and all were different from each other, with the range from highest to lowest being 8 psi. I binned the 2 that were the worst, and kept the one that was only off by 2. But that was still an 8 psi variance, when measuring a 32 psi tire! In what other endeavor is a 75% success rate considered acceptable?
While The Motion Pro is a bit...unwieldy, whenever I take a long trip it goes in the tool bag.