I have a 60 acre pond that averages about 10 feet in depth and my boat has a Lowrance HDS9 Gen 2 Touch and a Humminbird 899ci HD SI sonar. I have disappointing sidescan results in shallow waters of around 10 feet. I have set the side scan on them from 30 to 80 feet in range and get nothing unless I am within about 5 yards of the structure. The downscan works great. I need some help.