[quote name='chris_b' timestamp='1505775683' post='3374284']
If your rig is "overkill" just use 1 cab on the quieter gigs and both cabs on the bigger gigs. IMO what you currently own is a better rig for volume and tone, in a gigging band context, than what you're proposing. Are both cabs on the floor, ie side by side or are they stacked? Are you having trouble hearing your bass? There is nothing wrong with running an amp at 25% of it's maximum volume. If you do you get a thing called headroom, which is better for your sound and tone when trying to amplify low notes than trying to run an amp at 80%, for example.
I do gigs where my amp is at 25% and others where I'm at about 60%. That's like driving your car at 20 in town and 70 on the motorway. I don't see the value in trying to run a bass amp flat out rather than 25%. IMO a flexible rig is a better rig even if it just ticks over for some of the time.
Unless you're going through the PA a couple of 8's won't carry the room. 12's ticking over will probably sound better that a pair of 8's being pushed. Then again, you loose dB (volume) by placing your cab where it can't mechanically couple with the floor.
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Chris has articulated this better than I ever could. Big +1 from me.