i do not use fish id, but tomorrow i will turn mind on and give it a try.question, how shallow of water before you have problems? something that i see is you are using 200 narrow beam maybe try the 83 its a wider coverage area
looks like maybe in this picture that you have r/f noise interference.if so you ,you have a noise filter on your unit somewere.i donot own a lowrance i do not no how to access it.someone that owns one can help you