Crash, I have a "method" which has produced 32% wins and 66.41% palced over 4 years , and without ANY filters shows 3.15% POT(win) and 3% POT (place)

Just for interest sake I applied your idea to the basic selections without any other consideration other than PRE POST price (Tab-Form)

Reults as follows:
Above 5/1 29.17%w (25.75%POT) 70.83%P (29.17% POT)
5/1 + 22.86%W (19.11%POT) 71.43%P (35.43% POT)

3/1-5/1 26.36%W (1.98%LOT) 55.04%P (8.45% LOT)

1/1-3/1 37.16%W (7.85% POT) 71.56%P (4.62% POT)

1/1-LESS 38.89%W (29.28%LOT) 77.78%P (1.11POT)

1/1-1.5 40.58%W (10%LOT) 76.81%P (6% POT)

Of course, this only applies to my particular selections of course, but still its food for thought, the safest option seems to be 1/1-3/1, 5/1+ looks too good to be true, 1/1 or less seems like a BIG no no!