I just picked up an 06' Bunton 52'' ZT. I noticed that it was leaving strands of grass sticking up after cutting. I attributed this to dull blades. Well I replaced the blades with brand new high lift blades, and it continue to leave grass behind uncut. What is the issue? I was thinking maybe it was just under powered at 19hp, but it leaves strands behind no matter how thick or thin the grass might be. Any help would be appreciated, having to double cut yards is really eating up time. Thanks.