My KYB's have been a disapointment for eight months until yesterday. My local tuner did a re-valve after 3 months which did help but it was not the cure, I spent a lot of time working with the settings trying to achieve something close to my buddies 250 YZf who uses the same tuner so I took my stuff back to him and asked that he duplicate my suspension to my buddies. On the next ride I felt it was better but still harsh.
On other bikes I sometimes found that I could actually reduce harshness if I increased compression so I tried it on this set-up by adding 7 clicks on compression and 3 off the rebound and Presto!!!! Like magic the bike was transformed. Suddenly I found that I didn't need to steer around rocks or roots, just ride over them. Also, on several of our trails there are sections of rocky cobble that usually would throw me all over the place but now the bike litterly tiptoes through these sections. The bike now gives me much more confidence in all conditions. Don't give up on the KYBs, there is a cure.