Put more air in both tires on the blower side, the weight of the blower might be
squishing the tires down more on 1 side, also causing the blower to be lower on that side. Old tires need more air when bagging.
2013 Exmark Pioneer S 60" Ultracut (Review with pics) http://www.lawnsite.com/showthread.php?t=410996
2010 Badboy Outlaw 6100 31 KAWI
2008 Exmark Lazer Z AS 60" U/C 28 Kawi
2000 Exmark Lazer Z 60" L/C Kawi 4100 + hrs strong