I've found sonar can be misleading, especially if I have already baited a spot, I've found clear spots that I know are clear, that look like they are right to the top with weed, I've decided that's the pesky rudd now though. not happy with eating all the bait, they are also mimicking weed. Like you say though I need a drop and also prefer to cast. If I don't get It drop it gets redone.