Elberoth,
The DartZeel NH108B also has no problems driving the Alexandria X2 to very loud sound levels - and the version with the SCNP chip can deliver more current than the older versions.
Which amplifier are you currently using?
Yes, I know. Sasha is the only exception in Wilson family. My previous Sophia II spekers were also perfectly happy with the Dart. I have even one friend running 108 with the Maxx 2 (2.25 Ohm minimum) and that is also (borderline) OK. I got my amp upgraded with the SCNP chip - my amp was one of the very first amps upgraded - but it didn't really help. You just have to realise that Sasha and Magico Q5 are one of the very speakers 108 cannot drive.