The central tread area looks to be down to the wear indicators to me, so one could argue that that tyre has worn quite evenly, in that all 3 areas of the tyre have become unacceptably worn at about the same time.
If you have both shoulders wearing, it's difficult to see what you could do to improve it, other than perhaps a little more tyre pressure, which might stop it rolling onto the edges as much in hard cornering.
If like mine, the pic is running off the right edge of the screen, scroll across, and visibly there's actually about 3mm of tread left until the wear indicators.
I tend to agree re camber. As TB mentioned lately, which was very odd for him to mention this particular word I know, that we are in the world of "compromise" (

) between cornering wear and straight lune stability, regarding the camber setting. Which like you I dont see where the camber setting can be improved. I'm not sure TB acknowledges the existence of the word compromise, especially when driving, but he did say it.

My only question re set up iregarding the standard Toe Setting is does it need to be decreased for a Poly fronts. Given poly in both wishbone bushes needs a zero toe setting going by Tony's posts a while back. There's is an audible squeal on long sweepers, the volume of which can be adjusted in reverse by the loud pedal.
Gas it hard mid corner and the squeal is gone. Throttle off, or reduce throttle and it gets louder again.
If toe was less, would that help the squeal, and hence wear on the outer edge...? (Bearing in mind car is in a mid corner attitude. My brain can't visualise it clearly, but any +toe setting would be increased in a corner with an amount of turn on the steering Afaict, add in cornering forces and the rim pushing the tyre bead outside the tread forcing the outer edge onto the road and moving the inner edge contact patch nearer the middle of the tyre.... I think...? )