You are pretty well doing all the right things fishing around fish habitat like stumps limbs and thick cover. Crappie (sac a lait) will all do about the same things that the others are doing at the time. That is if they are hanging close to cover most all of them in the lake seem to be doing the same . The depth is something else that they will do the same. A lot of the time if you know about what depth they are in they will all be about the same depth through out the whole lake at that time. You don't have to have trolling motors or sonar it just helps locate fish it doesn't make them bite. I would say if you are catching two or three you are still doing good. Sometimes the wife and me go and don't catch that many. I think that is why they call it fishing and not catching. I am sure others here will be able to tell you more. You have come to a good place to ask questions and learn. Be safe and good luck fishing