Of the 5 who were better under the old set(3xA-, B+, B), 3 shot worse under C+/B-. Overall, nothing significant, .4360 to .4346.
Of the 3 F starters(finished C+/B-), all shot much better. .4038 to .4900.
Not sure much was learned other than the difference between F/D and C+/B- is huge while the difference between A- and C+/B- is not.
I'm sure most vets knew this. Getting to A seems rather pointless.