.... May be with some strings that were coated too heavily or older basses with primarily passive electronics, which mine was, aside form the Bartolini line buffer... but the grounding and everything is the same on all of them and it sounds great with a set of regular gauge Ernie Ball's on them... I just couldn't get past the lack of bass in them, as well... when I bought regular gauge, or whatever was closest to that... plus they were cheap! lol... When you think about it, though, if they are entirely coated, it's just like magnet wire, and they will make no contact with the bridge or your fingers... the string ball will likely ground on the bridge, but if nothing else does and you have any RF floating around, say from a dimmer, computer monitor, TV or flourescent lights, which is pretty much all of them now, then you will pick up some buzz... and my rig is full range, with a tweeter, so it was like a chainsaw cutting through a snare drum! lol
I have coated strings (all but one are DRs) on all my basses (except the one that has flats), both passive & active, with four different bridge types. And I've used the DRs on other basses I no longer have (SBMM, Ibanez). Never had any grounding issues, or lack of bass, or any other problems due to strings.
Bad set?