The only bomb bay tank configurations for the (non-tanker) Vulcan B2 which we used in the mid-70s (whether ex-Blue Tool or free-fall ac, 200 or 300 series engines) were:
'A' Tank Fwd
'A'&'E' Tanks
Drum Tank Fwd
Double Drums (One fwd, one aft)
'A' Fwd, Drum Aft
I'm pretty sure that the tank suspension points were the same for all ac. Wasn't it 5.5K in an 'A' or 'E' tank and 8K in a Drum? Can't recall and I no longer have any books to tell me.
......and Sod's Law always gave you a 98%+16K ac with 88K total fuel only when the low level Wx was pants and you then had to go and do some high-level bore-ex for the navigation team to involve themselves in some weird astrology!