You are on the right track, keep changing not only colors but sizes, speed,depth,type of lure,area, depth of water,etc. I have caught hundreds on cranks, many days, a change in TYPE of lure works better than changing anything else. As an example every day I troll I use two Cotton Cordell spot minnow type lures, the rest (I generally run 6 rods)lipped lures bandit, bomber, norman, etc. Some times for a week maybe two 95% of my fish will come on the spot lures. Then it may change and all be on long line cranks. You just never know. keep trying, it Will work. Hope this helps you some. possum1