Originally Posted by SpraydbySprague

Gonna go over the obvious list here. Please do not take offense.

Are you seeing this wear inside of an 8 minute run?
Do you rotate your tires from left to right after every run?
I'm guessing your track runs counter clockwise?
If this is the case there will always be 4 more right turns then left. No matter what.

The extra right turns needed to complete the course will cause the left tires to wear sooner than the right. This is why it's important to rotate the tires every round.

If you see this type of wear inside of 8 mins, you may want to go over the setup as well as how you are entering the turns. If your car is sticking the front end and sliding the rear, this may cause excessive wear.

Some more info on your setup may help.