I have a toro 21" proline that has kickers under the deck. the one in the back fell off and now I have two. The mower has left more mulched grass on top the lawn now. Just for fun, I took the kickers off today and the mower cut like crap. So I put the two back on. I'm going to replace the missing kicker soon, but what blade should I run and how do I keep the grass from clumping and leaving those lines of cut grass under the rear wheel? Do I have lack of airflow? How can I get this thing cutting the way a darn toro mulcher should?