Thin High End

I own a Musicman Stingray 34 and am looking to shape out the high/treble end of things some more. Being that it has active pickups, it has a really hot tone yet whenever I go from the low end to high it really loses it’s intensity and sound much more than any other basses I have owned. Does anyone have any recommendations as to tips to help shape the sound or get that soundwave to match more to the low end. It will literally be about half the physical size of the low end if looking on ProTools. Strings, pickup switch, tone knobs, string height? Any help would be much appreciated!