That's what I'm saying about going back and forth. I can't! I'm 5er only now.If you really want the low B to sound "big" on stage, you really need a bass amp and cab that can handle the fundamental. That's a BIG amp! I played 4 string all my life. Picked up a 5 string at a few open mics and it confused me totally. Figure just don't play the low B string but some how, my fingers "muscle memory" was totally thrown off.
I've got a big amp, Mesa M6 w/ 2 15s, but I almost never play open B. D quite a lot, but with the key changes I almost never play open positions anymore. The fiver helps with that.