Just a few thoughts.
1. If you can pick up your anchors, they're probably not big enough or designed for the bottom surface.
2. If the PCV buoy arms are already bowed, you might need to replace them. Regardless, the current will bow them, so see #3.
3. Add river adapters. They will connect the end of the turn ball arm back to the mainline to ensure everything stays square with the force of the current trying to move the turn ball down river.
4. Is the course straight from a boat guide lane perspective? If you are not straight down that, the turn balls will never be square. Getting the mainline tight and straight is step one before anything turn ball can be addressed.
There are others here that are more experienced with courses in rivers, but it is an art. As you tweak and maintain the course over the years you will learn what works and what doesn't work. I used to mess with mine 3-4 times a year trying to keep it nice, now I have it setup where I don't do anything for multiple years. Sounds like you have yours in a pretty difficult situation. Might be best to pull everything but the anchors each fall.