If you haven't done it in a while or since you got them, try positioning your speakers slightly differently. I find that with MLs (I have SL3s and have an acquaintance with the Odysseys), the sparkle on cymbals and the transient on drum hits is highly dependent on vertical angle of the front plane. Try raising the back of the speaker by adjusting the spike/foot in the back, making the front panel more vertical as it faces you. You can also try adjusting toe-in/toe-out slightly.
Martin Logan vs. Thiel
I have a pair of Martin Logan Ascents and I'm in the mood for something different. I'm missing that tweeter sparkle you hear on cymbols etc and was thinking of making the move to a Thiel 2.3. I've heard that they image and offer as much detail as the Martin Logans. Do you guys agree? I know people say they may sound bright in some systems but I'm running Goldmund and Classe so I don't think that will be a problem, but will the Thiels image and soundstage like the Logans?