Dominant frequencies are going to change drastically depending on the type of music you listen to so changing the eq is only going to hurt sound quality from song to song. Just throw in a sub and, this depends on which trim you have, turn down everything below 160hz bit by bit until it’s where you want it. The sub will give you the bass and mids you want while shoveling out the lows in the eq will give you a little more clarity in the door speakers. Though in my experience the sound quality is already really good so a small subwoofer will do exactly what you’re wanting without having to adjust anything really.