Well here's something to try not to say its going to catch you more fish but it would make you feel better about seeing them as said earlier. Not sure what unit you use or trans degree it is. Unless your ducker is kicked at a wrong angle, or a thruhull, you should be seeing the balls when your sending them down. At least at a stopped positIon. Try turning the sensitivity up, or surface clarity down etc to get more of a better picture. As I said there's a ton of stuff you can try but these are just some starts. I'm surprised you didn't mark much with that much travel today. Others I'm sure on here will be a huge help. This is an awesome site for this kinda of help