Tread looks good. If the graining was significantly more, then you would be getting them too hot, or if the graining was less, then they’d be too cool. Color looks good. Doesn’t look like you’re running too much caster as evident by the rear wear. Honestly, if your kart is feeling good on both entry and exit, I wouldn’t change it JUST to keep your tires wearing more evenly, but would recommend swapping the left and right front tires.
Keep in mind that what works well for tire longevity doesn’t always work well for handling and speed. :)