Do you think that changing out the tonearm cable or silver plating the connections could result in giving you enough latitude in order to get things where you want them? I guess then a different or additional approach could be to test out a variety of tubes. I'm no guru but my understanding in general is that if your phono stage is set close to the cartridge specs, you should be about right on. Sort of like setting the film camera to the exact exposure meter rating. I don't mean to oversimplify the topic however, as this is truly an art and not just a science.