W-B24,
Well, there you go. The judges want to keep it simple, Bias-ply tires for the cars that they came on.
If they started making adjustments for all the variations that can be used on a car then the weight of the rules book woulld exceed the tax code,
Not only that but pretty soon someone would want to start using hydrogen (whatever) in the tube and/or tires. There would be no limit to what would be proposed, If we make it difficult for the judges then pretty soon there won't be any.
Put your bias tires back on, Dodge the potholes,
Charlie
BTW: 16 points off does seem to be a little heavy on the penalty scale.