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If it were me, I would start by verifying both forks rise equally high above the top (crown) plate, then I would do a shake-check on the front end to be certain its square. Next I would visibly inspect fluid level is correct in both (see manual). Then I would raise the front wheel off the ground and do a visual bearing check AND verify both front brake calipers (and their pads) are good to go (see manual).
You obviously know how to ride it so no worries there. Sometimes you just get a bad tire. But in this case, from what you posted, it seems like it's front end geometry.
BTW that fork preload setting will not produce that kind of tire wear as long as both are set identically and fluid is correct, and the springs are good to go. It's why all need to be checked. I just try to check the easy stuff first.
You obviously know how to ride it so no worries there. Sometimes you just get a bad tire. But in this case, from what you posted, it seems like it's front end geometry.
BTW that fork preload setting will not produce that kind of tire wear as long as both are set identically and fluid is correct, and the springs are good to go. It's why all need to be checked. I just try to check the easy stuff first.