Just got a set of Lyriks. The previous owner had TF fit a coil u-turn and MiCo DH about 18 months ago. I took them out first time today, and I really can't tell the difference between full-on and full-off on both the high speed and low speed compression. Also the rebound doesn't seem to have any effect - on my old Pikes, it was very sensitive and you got a 'breathing' noise when the rebound was set high, presumably oil rushing through the damper itself. When on full the forks took an age to fully rebound; on these Lyriks there's little if any difference.
As none of these things seem to be working, might it just be lack of oil in the right leg? Condition of the forks is very good so I can't/don't want to believe there's actually anything wrong with them.