I think I responded to your earlier posting showing the shroud. My bad. I’m wondering about the water pump though. What you are running is a mystery. Whenever I read about issues like you’re having I always look at the number of vanes on the impeller. You “may” have an issue with coolant flow, maybe not. I suspect and ask based on what I went through a few years ago with my setup as well as others. Doyou actually know the number of vanes on the impeller?? If you don’t, I would be pulling the pump to verify things vs resorting to pulling the top end apart (yet)