I play a full set of Gut-A-Like strings. They have a copper wrapped, synthetic core e-string. The a, d, and g strings are great....nice and even. If I am playing a walking honky tonk or swing type song, anything I do on the e-string drops in volume below the other three strings. It dosn't seem to punch through. What is a good e-string with a good volume output that is still good for slap?