In regards to the discussion of the stability of the Lace, I find that the heavier the disc the more stable the flight - but only in the mediums, can't speak to the firms.
When I first started with the Lace I had a 159, and it helped me learn how to throw perfectly flat. After I began to turn it over I moved to a 164, and right now I can throw it around 330' - 350' almost dead straight (like a little room on the left side early in the flight to get the best, tight S). But I still can't throw a 173: it just performs a short hyzer death - no glide at all.
For me, the Lace does best when thrown flat. When the 159 started to turn and burn I was unable to make it hyzer flip - I would love that in a Vibram driver.
I recommend throwing all Vibram discs as flat as possible. If it fades too early, weight down; if it flips too much, weight up. Then again, I'm almost 50 and don't have a big arm.