Found an interesting solution to the knee pain that I had developed on the Q45. I had been tiring the Ventisit pad but had a bit of recumbut so added a 1.5" foam pad. I had a bit of knee pain before the pad and had adjusted the boom to get the optimum fit. After adding the pad the recumbut was gone but the knee pain got worse and no amount of boom adjustment helped. I got to thinking that on my DF I would have moved he seat back a bit, an adjustment that's hard on recumbents. To get a similar adjustment I lowered the seat as much as my custom seat brackets allowed, went back to the thinner stock pad and added a 3/8" gel sheet cut to fit under the cover (overall lowering the seat ~1.25"). It seems to have cured both the recumbut and the Knee pain. I did order some 155 rotor cranks and Q rings to help with the knee issue, so we'll see what change that makes.