Wet or dry thin blade grass flops over if cutting to high. We have always had trouble and all our lawns are irrigated so you do the best you can and doublecut when necessary, all decks have issues under certain conditions.
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