The weird bell sound could be your hand inadvertently fretting the G string when playing up the neck on the B string. I have shorter fingers and have to watch for this.What I tend to find is that the B sounds weak by comparison on passives, while on actives the you can get a strong B with EQ, but that leaves it sounding fake and lifeless compared to the higher strings. You also tend to get weird bell-like sounds on the B string, especially on the higher frets.
Incidentally I've never had this problem people talk about with a 'floppy' B... it's just the sound.
I would go back to a 4 because of wrist reasons but no cash and I have my Lakland bass modded and setup up exactly how I like it. Still main reason is cash.
Wow....