Disc brakes behind the blades cause a downward reaction force on the axle. This is more pronounced on the left side.

So, at first glance, the chipping and wheel tilt are consistent with the axle moving under hard braking loads.

Start by confirming that all is right with the wheel fully pocketed in the slot. The best way is to mount the wheel on the floor so gravity pushes the fork home.

Assuming the fork is fine, and it's a movement issue, a better QR isn't likely to solve it.

There's a mistaken assumption that the QR secures the wheel from moving within the dropout. In truth, the QR's job is to compress the dropout against the axle's face, and that's where the hold happens.

Rather than spending on a skewer, focus in improving the bite of the left axle face. If you can find a thin steel serrated washer, try that. If it works, you might glue it on for convenience.

My preferred solution for things like this is traction paint, like they sell for stair treads. No need to buy a gallon, you can mix some fine sand or similar into nail polish, and paint the axle faces.


PS the minor chipping doesn't matter, but use some "paint" to seal the damage.