A source component and a receiving component and a wire form a transfer function, and no one can guess, without knowing exactly the source and receiving component, how any cable will behave beyond generalities, i.e. like a low inductance cable "may" increase your output at 20KHz by a fraction of a db, or increasing the gauge of your cable may increase the bass output primarily by a fraction of a db. Beyond that it is guessing and conjecture which is why there is absolutely 0 consensus. Fix your acoustics if you have not already. It's a way better investment. As you DIY, you should be able to identify cable bottle necks. If you can't, perhaps that is not it?