My opinion is that if you're running the level control of your line stage only a little open, you're risking overloading its input stage with the HIGH output of the phono stage. I'd use the phono stage's low-gain setting.
PS. It's a 'moderate-OUTPUT' cartridge, not 'moderate-gain'. Gain stages, not cartridges, have gain (= voltage amplification). :-)
PS. It's a 'moderate-OUTPUT' cartridge, not 'moderate-gain'. Gain stages, not cartridges, have gain (= voltage amplification). :-)