
This is a sort of "closed" valley system that I have only seen used with standing seam one other time. On most valley systems, the panel ends are folded over a cleat in the valley. I would not know of any ways to stop leaves from collecting on what you have. I am sorry.
I has a standing seam roof installed summer 2021. The offset cleats in the valleys are crimped over the panels trapping leaves. I have found no videos or manuals showing this as correct procedure. Your thoughts?