Curious if anybody has a fix running these tires on sledge to avoid the rims rubbing a bit at full turn lock? Would different offset hex hubs solve the issue or maybe a thin washer or two on axle hub?
Yes.
I ran Backflips 6s on my Sledge for a long time. I used 10mm offset hexes to get the steering geometry back to where it should be. My Sledge's steering improved with them.
Here's a picture of a Sledge with Arrma Backflip wheels.