I run a 36" exmark metro. I'm currently running meg-mo blades. With any dampness on the grass I get so much clumping I almost can't us the machine. 1st - the belts are tight 2nd - It's not the bag. The way I know is that when I shoot the grass it will through fine for a couple minutes then it'll start shooting out clumps. Makes an unacceptable mess. I've tried to mow over the clumps and it just makes more of a mess. 3rd - when I'm done with a lawn I get about 10 to 15 pounds of grass from under the deck 4th - I am using that under deck spray my dealer sells. I'm at a loss. HELP!!!!!!