I've had the same issue. I first noticed it when i was helping another racer set up his Cyclone Worlds Edition and he had 2 degrees of toe in on the left and 3 degrees of toe in on the right. I thne checked my car and found I had the same thing. Someoen her mentioned loosening off all of the screws holding the toe blocks in and adjusting them so the toe is even. I did this and got about 2.5 degrees on each side w/ the 3 degree to block.
I might try the 416 rear knuckles if that will get rid of the problem. Also thinking of going to the 37/17 pullies as my centre pulley has no teeth remaining and it seems like as good a time as any to upgrade.