IMHO, you don't have a problem. Almost every system I've ever owned or sold (and that would be MANY, MANY, MANY systems), have all required the volume to be around the 10 o'clock position to get a half-way decent amount of output.
I have a Sanders ESL amp that is rated at 360 watts into 8 ohms and doubles all the way down to 1 ohm. It runs a pair of Martin Logan CLSIIA's and my normal listening level is between 12 o'clock to 2 o'clock. Depends on the source, but usually around that level.
It also depends on the output gain of the preamp and the input of the amp, but still, I think you're fine.