Dave, don’t mean to horn in. The Capt. Certainly has much more experience than I. But one thing I do know, regardless of the devices that are used, one needs to know the tested data that proves the depth curve of any device we use. If the divers you bought came with that data, or if it can be acquired, you have high percentage of what you need and they should work just fine to the depths, line lengths, line types, and speeds that are recorded.
Use the data and your sonar to place your baits where the fish your are targeting are at. Then just keep on learning. This place is one great source of information.