Walleyes love moving water, think spillway.
My son was out there on E.Antioch and some guys were tied to the spillway bouys fishing for brim. All they were catching was walleyes,they didn;t know what they were.They showed and asked what they were.
If I could have days like you I would fish for walleye every trip.
There are no spotted bass in any of the rocky mt PFA lakes, only largemouth.
It's my understanding that they generate/pump water at night. I think that's why they run you out at dark and don't open the gates back up til the next morning. My theory is that all the heavy feeding goes on during those times. Maybe the reason the Walleye won't bite for you during the day is because they are still stuffed from the night before.
It's been my experience that it takes some sort of pretty good front moving through for the fish to bite really good out there during the day. How many largemouth over 5lbs have you caught during these 2 trips? Because they are plentiful in there too just like the walleye are supposed to be. So, if you haven't caught any of them, maybe you are missing something, maybe a slight lure/presentation change to get the pickier ones to bite.
Having said all of that, I'm not sure those 3 lakes are even used in the daily generation. There are more lakes down in the valley that are closed to the public that may be the main generation lakes.
Plan your next trip there in the middle of a rainstorm and they'll bite. Also, most of the baitfish in there are really small.
Well actually there is a way to fish it at night. If you camp there and fish from a kayak or canoe...I believe you can stay out all night