I have a Mini Z 52in Model#927236..Ser#05091658 I am using 795526 blades and a high lift on the discharge side. I have problems with the grass clumping on me. The grass is getting stuck in the cutting deck really bad sometimes also. I don't know if I should change blades or what? The tall stiff weeds are not being cut like they should. They are left tall or bent over. I have to go over twice or really slow to get a good looking cut. Is that due to lack of vacuum in the deck? Please let me know what you think. Thanks.