I have a new Lowrance Elite 7 HDI this season. The broad ban sounder will not reed fish or baitfish beyond a fast idle, it reads depth, but screen gets grainy past idle and must loose sensitivity. I have isolated the wiring for the most part and gets it power from extra battery, not the primary that anything engine or assecories are powered from. Ferrite choke filter also installed or check that, 2 installed. Transducer placed In proper area according to manual and common sense. Any feed back?