Hey ya'll I'm new here, 1st post....anyway, I have a small lawn business and for a while now I have not been satisfied with the cut that my mower is giving me. It's a 21" Husqvarna 5521CHVB. It has a Honda engine, the GCX-160 I think, correct me if Im wrong. I tried sharpening the OEM blade but that didnt help, then I bought a unversal blade from the hardware store but still no improvement(almost worse in fact). Ive got a Gator blade on order so that may help but lately Im thinking its the RPMs. Is it possible to adjust the RPMs even on the smaller walk behinds? If so, should it be set to 3350? Also should I attempt the adjustment myself or take in it to get serviced...Im somewhat mechanically inclined. Sorry for the long post, and thanks for any help that yall can give me.