So I have a Lawnboy walk behind with the smart drive speed thingy (pushbar controls drive speed). Past few seasons it has been leaving progressively worse grass clumps behind as well as missing patches of grass while mowing. These missed pieces tend to be approximately centerline with the mower deck. I tried sharpening the blade without improvement so I replaced it- no improvement. Definitely gets worse in between cleaning the deck of built up clippings but also is present with a freshly cleaned deck. This is making me want to upgrade to a nice, new Husqvarna but not really in the plan for this year. Any suggestions to combat this issue (other than even more frequent mowings)? I do typically cut with the mulching plug in but if I miss a cut I have to open the side cute otherwise it bogs out pretty easily.