I have a John Deere 4520 with a 6' Woods BB72 mower on the back. I've been mowing fields for more than 20 years and have Never had this problem. Whenever I mow a field, that mower leaves clumps of cut grass. I had a 6' Bush Hog that I used and readily liked until the slip clutch didn't slip once and it got completely destroyed. That never left clumps like this Woods does. I'm mowing in the same gear, doing everything The same but getting clumps. Should I remove that plate in the back to let the cut stuff out? This really bugs me. Any ideas?