cartridge is 0.4 mV signal, 12 ohm coil, correct?
Gain settings: 40, 45, 50, 55 or 60 dB
Loading: 100, 200, 475, 1k or 47kOhms
have you changed the jumpers inside the unit to:
gain 60 db (max signal boost)
loading 100. (you could also try 200, but start with 100)
after those changes: NOT ENOUGH VOLUME?

