I was out a couple weeks ago on the S arm with similar results. There is a point just west of the handicapped pier where the “lake” side of the point drops into about 12 ft pretty quickly, while the point itself and the cove behind it are relatively shallow. Bass were in there sitting underneath giant balls of baitfish and every few minutes they would come 1-2ft out of the water while smashing bait on the surface.
I found a spook type walk the dog bait to be effective when they were up top, and a deep diving crankbait on the lake side of the point to be the ticket when they weren’t actively smashing minnows.
Tons of 12-16″ fish in MacBride right now. This summer has been nothing short of spectacular.