Agree with Plato, and also with Russ about the relevence of quoting the very meaningless manufacturer's distortion specs. Do what sounds best to you, but if it doesn't help the sound appreciably, you're technically probably better off without it. However, if more dynamic and accurate overall sound is what you're after, and especially if you find you need to keep the EQ in-circuit most of the time to get enjoyable sound, you should probably consider beginning at the beginning to undertake a comprehensive upgrading process that will eventually render all the outboard 'help' obsolete.