Just along the lines of the darvas box, maybe we use the rules for the lower bound of the box to set the low, which should be at the 50% fib. I.e. low can't be exceeded for 3 bars etc.(maybe pick a higher number similar to turtles issue). This would let us identify what should be the low for the pattern, and get that early entry with some more confidence rather than just "catching the knife" hoping it bounces at the fib.
@W3hunter, you're up, another idea for you to back test!