Some hard core enthusiasts actually recommend running the volume on the pre amp up as far as possible, as it allows you to hear the true sonics of the pre amp. So.. if you had gains on the amp, they would recommend turning the volume on the pre amp to 100%, and adjusting down the volume with the gains on the amplifier.
My point being, it should be just fine to run the volume up as loud as you need to be comfortable. Remember, just because the volume pot is cranked, doesn't necessarily mean the amp/pre amp is working very hard.
My point being, it should be just fine to run the volume up as loud as you need to be comfortable. Remember, just because the volume pot is cranked, doesn't necessarily mean the amp/pre amp is working very hard.