Have you thought of a nice 2 way crossover and a sub crossover? This may improve your options and keep the adcom only running the non-directional stuff. I would much rather hear the tubes for the whole vocal range and just let the adcom do what it does best-be a workhorse.
By the way, many older dynacos actually limit the highs and stress the mids (which they do really well). When I had my MKIVs redone, the guru actually eliminated something to improve the highs. I wish I remembered what, resistor, cap? It did help. His theory was that 30-40 years ago, the only thing that went above 15khz was "hiss". None of the recordings nor most of the speakers really produced the upper ranges so many designs added circuits to limit the hiss.
By the way, many older dynacos actually limit the highs and stress the mids (which they do really well). When I had my MKIVs redone, the guru actually eliminated something to improve the highs. I wish I remembered what, resistor, cap? It did help. His theory was that 30-40 years ago, the only thing that went above 15khz was "hiss". None of the recordings nor most of the speakers really produced the upper ranges so many designs added circuits to limit the hiss.