So I had a pair of matched JJ E34L's and another pair of Electro Harmonix EL34EHs. Placed the E34L's in the inner sockets, and the EL34EHs in the outer sockets. Biased the E34L's at 43mV, and the EL34EH's at 36mV.
HUGE IMPROVEMENT! The E34L's seem to give that extra umph, but still retains...