I've got a new ESP 4-stringer, active pickups, and I'm finding that the tone (or maybe volume?) is quite different across the strings. I'm playing through a 100w Yorkville combo. The E is just huge, I love it; A is fair; but things get very thinned out on D-G. I really haven't fiddled with the knobs much; is this maybe an EQ problem? BTW, we're playing rock and I'm approaching avg skill. I'm contemplating a GK head in hopes that this is an amp issue.