Same concept at Calaveras. My best luck was closer to the dam bank fishing.
Went yesterday at sun up and fished the top arrow on your map. Used shrimp and fishbites on my 10' surf rod using 5 oz weight and double drop rig. Caught my first red!....about 10 inches long.... haha!
Regarding that location (known to some as the "horse shoe" to some), we were right on the western tip casting straight out as far as we could. Reeling in, we got a lot of hangups and lost a few rigs. Early on, my partner hung into something pretty big and strong but when he got to within about 10-15 yds of the bank he got hung up. The fish was still pulling but he couldn't get it loose so had to break the line off. Moving to the north side worked out a little better with no hangups but we didn't get any fish.
The only thing I can come up with is to use different shaped weights...we had pyramids on from a previous surf fishing trip.