2nd hand info, but I am told some of the Xray drivers were actually using 6 degree hubs angled forward to good effect.
Has anyone tried changing toe at the arm (similar to front arm sweep) with the same toe at the knuckle to get varying results? You could adjust for some amount of the width in that way depending on the effect. I got the blocks to run 0 and 0.5 but have not tried it yet. 0-0 will bind the hinge pins.