Welcome to the board
That's a tough question not being on your boat or familiar with your unit. However, with my old Lowrance (without down and side scan), I would leave it on Auto setting. Even on Auto, there was a way to "back it off" by going -1, -2, -3.
There was too much Clutter at the Auto "normal setting". I also backed off on Clarity and noise rejection.
The good news is that with fish schooled up, it should be easy to adjust your unit during this time of the year. When you see fish breaking or birds working in an area; slide your boat over them. LEAVE YOUR RODS ALONE
Put your emphasis on your fish finder. While drifting, keep backing your unit off on the settings until you get rid of all the clutter and the fish "arches" are clear and distinct.
That's the only suggestion I have. Others will chime in with more beneficial information.
5th