Humminbird Color Sonar Setup

I have a 787c2 Dual Beam and have had some problems getting fish to show ever since I got it. I recently reset it to default and made some minor adjustments and that seemed to help but I think I am still missing something. Right now, the sensitivity is set at 15 out of 20. The noise reduction is set on low. The Speed is set on 7 out of 10 when I'm moving. It picks up the bottom detail and a few fish but I know there is more there.

Can anyone with a humminbird give me some advice or share how to set it up to show fish?

Is fish-id on?

No sir, I prefer to see the arches.

I would suggest using the 200/83khz. This will give you wider cone angle. This option is under the sonar tab. It is probally only set on 200khz. Try this feature and see how you like it.