I have a 48 hydro Lesco with a 17 hp Kawi. My problem is it started not picking up the grass even when I go through grass that's not that high ( I know it used to) it leaves cut grass in like a light layer on the opposite side of the chute. I tried sharpening the blades, I've tried changing to hi lift blades, I tightened the belts, turned up the RPMs, tried it with no catcher, tried it with a catcher, the deck isn't bent underneath. Not really sure what it could be. Any ideas?