I like your ideas and many shows incorprate many of them already so here are my comments on each one.
1. Yup I agree totally
2. Lot of work to fill that out exactly. The size catagories are a range already so its easier just to put the size catagory. Maybe a poster somewhere at the show to explain the size catagories.
3. Well i suppose you could list that but many people might not know or if they have a bonsai they might not want to say it is a 12" 4 year old.
4. That would be good but maybe something to leave out until after the judging? Some judges might not like certain breeders and really like others. I'm no judge but I think that information doesn't need to be public while judging.
5. Yeah um well I don't know the oyagoi for most of my koi.
6. Could be helpful and make for a nice learning thing I guess.
7. No way should this be posted before judging. Judges are honest people so I don't see any reason to post this and possibly cause bad feelings because their best friend just happened to win GC. Better that no one knows until after the judging.
8. I agree
9. How about you just post all that info after judging.