I've always been disappointed in the balance of tone on bass strings. The high strings were too zingy and the low strings too dull. Of course it got worse as they aged. Dean Markley made the stainless Helix that had an exposed core on the low strings (E and A, probably B) and that went a long way towards balancing this but they quit making them. Does anyone else feel the same way, or found a solution?
This is one of the "problems" that multi-scale instruments (Dingwall, et al) address. I wouldn't say the zinginess-to-fundamental balance is perfectly maintained from string to string, but a 37" B at high tension is going to have less flop and flub than a 34" string.
P Basses, Jazz Basses, Warwicks (5 string), Musicman (5) 45-105 -ish. Sometimes lighter. B strings around 128-130
It's nature of string physics and acoustics. So we all have to live with that imbalance. Yes, there are some tricks like multiscale, string gauge choice, HPF, LPF.
Since you mention Musicman 5, I suggest a try on EB 2816 Cobalt flat or EB 2810 group flat. EM are seriously made their own bass string great match with their instruments which has great string to string tone balance and output. I have a set of EB 2814 on my jazz bass , focus solid E string till full meaty sounding G string. Hopehelp
I've never been annoyed by the lack of brightness in low strings; the only thing that sometimes bothers me is a high string (= G) that sounds too "thin and twangy". It seems some makes/models are worse in that regard than others, though.