Looking for some help with cut quality, leaving lots of stringers, brand new blades, high lift OEM Hustler blades. Humboldt whirwind bagger. Speed doesn't seem to matter I can go full speed and it doesn't bog or anything, just leaves more stringers, even going slow I have to double cut. Deck was leveled last week, new idler pulley. What am I missing? double cut looks perfect, level and clean no clippings, but this should be good at one pass.