The few times I did it was in August full moon. There were lots of smelt in the system then, (mid 90's) so I targeted suspended fish in 35-50 fow. I put on deep diving cranks, since I had no lead core. The one night I had great success, all fish were over 4lbs and I think we ended up with 6, but lost a couple due to my wife and at night. We were drinking too lol. Also we left when the wife wanted to go, it was really just getting good. I kept it simple by going deep, just stayed right off/next the moose flats in Mobridge in 35-50 feet. My cranks were running about 25.
My brother was in a couples tournament a day before and our smallest fish was bigger than all but a couple fish brought in from the whole field. There was no slot in SD at that time