I think it can work.. Just by talking about culls, deformities, etc.. we are making people aware of what to look for.. Your clownfish were very nice.. I sort of judge percula clowns like a Labdrador.. Big head, large even jaws, large upper body, and very proportional.. LOL.. But if it looks good, no uneven fins, over/under bits, weird body shapes, etc.. And has the full baring pattern of a typical clown of that species.. I would call it an A1. The slight bend in the 3rd stripe may not make it "perfect", but it is the of the highest quality fish, IMO..
Another note.. but similar.. I think we have to start our grading with the traditional clowns.. Designer clowns are just too tough to judge. The patterns are all so different that opinions are too subjective.. Or, you can only really judge them by their physical features. We can't grade those patterns.