Yes Tom you are right on the top plate angle, the less angle does make it cut smoother but no one has said anything about the old .250 chain for racing in the small classes , it is real light cuts great , hard to find gears for but the gear companies make them, i have ran .250 in hardwood shows that i won so it will cut on a 2100 , there is other chain that people are playing with like 7/16 , it old but filed right is works Bush is trying 5/8 chain to