All good advice. Both my phono preamp and line preamps have several gain settings and I found that the most critical gain setting is at the phono stage level. You want to use the lowest gain setting that allows a good rotation on your line preamp. From my experience, too much gain for a given cartridge's output results in a harsh, shrill, and overall unpleasant sound. Using the KAB calculator, which I find to be quite accurate, the optimal gain for your cartridge is 58 dB so it makes sense that you'd find the 56dB level to work well.