What power amp are you using? I am guessing that the Audio Mirror PP1 is a tube preamp, correct? If so, it is overdriving the amp by not allowing you to use more of the volume control's range. Try replacing the input pair of 12AX7's with a pair of 12AU7's for lower gain. This should allow you to use more of the control's range, up near 12 o'clock.
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