I usally only look at the hands per hour. That tells
me if it is a loose table. The adverage pot size is no good because one pot can change teh adverage drasticly. So for me I make it simple. A lot of hands 120+ and a loose table. I did as you are trying to do find some complex certian way to choose a table. But after finding a formula I liked and made sense it seemed it wasn't that great so............ I just jump on any table with one seat open 120+ hands and go for it. If the table is not to my liking I just move.
One other thing If I happen to see a table like this and it has a very low flop % I come in quite tight pre-flop for 15-20 hands or so and if the table is really that tight I try to push it around hard and take some chips until I break up the action. Then when they start playing more, I tighten up post flop like a wet piece of leather. EDIT: And when they figure me out I find another table and repet the same game. Many nights playing .10 no-limit, I ran 5 bucks into a hundred doing this......Nasty I know but.....thats poker