Nice setup which includes two of my "wish I never sold" items namely the original WTT and the HL Monitor MkIII's! At least I've still got my Onyx. I never thought I'd see a system with those sweet sounding Harbeths on the 'Gon (which I originally bought ca. 1980). If you're so inclined, try stuffing drinking straws into the port and see what you think of the bass response...anyways it's reversible.
I assume that you drive your amps directly with the 834P? Do you bypass it's built-in MC stepup with the FR unit? Does this provide more gain or do you just like the sound better?