I’ve always found more negative camber to release the kart better off the corner. If you’ve got too much initial lift, you might want to go to a bit more negative camber to settle rear down on turn-in and help the kart roll more controllably off the corner.
There isn’t a hard and fast rule with camber in regards to track grip levels really.
If you’re getting excess front wear, I’d agree with the above that you’ve got understeer. I’d set your camber to it’s neutral setting, that should work for almost any condition, and I’d go a bit wider on front track width.