customer calls today and says "are your blades sharp" i said yea they should be i just replaced it about a month and a half ago. he then says b/c the cut looked a little rough. I use a comm. toro 21 inch is there anything that could be causing this? the only thing i could think off is i never bag but this last time i had to b/c we had a storm and a bunch of leaves had to be picked up. what do yall think?