In the beginning I had the same problems brushogging, solved it a piece at a time, I put an extra screen to help protect the original screen, it got better, then from this forum I took the advice of cleaning the fins, and not just in appearence, but cleaning the fins until the water flushed clear, it got better, so much better that I do this twice a year before I cut my fields, whether I have problems or not. IT IS PART OF MY ROUTINE MAINTENANCE. Removing the side panels on a hot day 90+ also helps, In tall grass I cut with my bucket on and lowered so in knocks down the grass and seed BEFORE it gets to the hood. Together these things work for me. I cut (brush hog) 25 acres of horse pasture at least TWICE a year, I cut (brush hog) 50 acres of my neighbors fields at least ONCE a year, now that is just a small part of of what I use my 4110, despite all that grass work, I have not come close to the "RED" mark on my tractor this year.
P.S. I think there is a kit from the dealer that lowers the battery to help air flow to the radiator.