This is an interesting thread seeing all the different opinions, can I just throw another worm in the woodwork, and believe me it is something I have a bit of knowledge about having made a LOT of money years ago from stable information.
The word is bloodcount, only the stable and the stable vet know on the day whether the bloodcount of the horse is 100% correct, and as I was told IF the bloodcount was not spot on even though the stable ran the horse they would NOT back it.
We can go on forever about weights and how long is a length ( If it was me measuring the rail and it was night time and I'd had a few glasses of my favourite the length could be 10 metres).
There are so many unknowns in this business that you will not find information on.
I admire people that can do form and CONSISTANTLY win as they are few and far between.
Just my two bobs worth.
I just wish I knew a friendly vet that doesn't mind copping a sling.

Cheers