I've got a Kubota ZD326 (26HP diesel, 60" cut) that when I get into a little tall stemmed grass with it (especially if it's a little damp, like early in the morning) the mower bogs down and almost nothing comes out of the discharge opening. It basically turns into a mulching mower (does not have mulching blades or mulching kit on it) and will even stall out if I don't stop it every few feet and let it catch up. I'm not cutting grass that is very tall and the deck is set a 3". My 26HP Gravely has no trouble getting through it. Now, if I'm cutting very dry, short grass it flys through it. Any suggestions would be appreciated. Also, it has a brand new set of blades on it and the engine seems to be running fine. Thanks.