u cannot rely on the open books prints, if i want to sell heavely a stock not in a million years i place my order for all to see and i am a small fish man, do u think institutions would do it? all those prints u see have no significance whatsoever, u might make money on your decisions but that's not because those orders told u the tale, just no way.
you will see size in the open book, and the size I see are "market shorts" where they keep stepping down until they get filled. Of course, I don't jump on any size just because there is size, I have to see it is aggressively stepping down, and keep getting bigger.