If modifying your stock bills doesn't get you where you want to be, you can also remove them completely (I use Dremel saw) any buy short, shallow-running aftermarket bills from suppliers like Jann's Netcraft. The trick to a full bill replacement, however, is to be as particular as a fine artist, and to test, and retest, and retest some more. Your ultimate objective is to create large crankbaits that will run 7 feet or less effectively, and in fairness, honing the process that creates these baits can take years. To put it in perspective, I have about a dozen of these modified baits that I cherish. It took me a dozen years to get them built just right, I've thrown out more than a dozen failures, and lost a dozen more to stubborn structure. Of course, I can also think of more than a dozen times they put me one-up on the competition in the right late spring conditions.