We are all having this problem up here too. I was concerned about a big lawn I was cutting and it was laying over with either mower. I looked next door and my main competitor (big company ) had 3 different mowers cutting and it looked worse than mine. He was using the new Exmark Triton as a demo with the mulch kit. He had an Unltra cut Exmark mulching, and he had an Encore side discharging. He could not get any of them to cut as well as mine. I was trying to think of a way to hang a flap on the front of the flex fork hanging down far enough to push the grass forward and going the opposite direction of the grass laying down around the edges to try to stand it up. But gave up on the idea for now. Time to aerate.........
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