Or would a tiered scratch system be better. 210+ use 200 as a base, 195-209 use 190 as a base, and 189 and under use 180 as a base.
To count score you would then use a +/- compared to your base.
A 220 shoots 230, that's +30
A 205 shoots 220. That's +30
A 179 shoots 210, that's +30.
And couple that with a tougher oil pattern