Hey Rob!
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the guitar and bass cabs were recorded at the same time with a powered mic
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That could be the problem causing the roomy sound. To make sure i got you right: you recorded guit and bass at the same time with one condenser mic (powered) in the room? If so thats what gets you a roomy sound.
Try this instead: record bass and guit seperatly one after another and use a dynamic mic (unpowered) which you place DIRECTLY infront of one speaker, especialy when recording guits. Place it so close to one speaker that there is nearly no space between cab and mic but without contact

. You will have to try around a little with the angle of mic to speaker for the crispiest place.
This way ("no distance") you can reduce recorded reflections from the room, what is giving you the roomy sound.
Standard mics for that (esp. guits) would be Sure SM57, Sennheiser 606 or 906 but thats up to you to try out (i think you got something fitting in stock with your drum mics)

You can still use your condenser mic as a second signal (set up 3-5ft away from cab) and see if you wanna give a bit to the mix.
Your plan to record the bass via DI signal and mic is a very common way and will probably help you to achieve your wanted sound. Try that!
As far the mixing is concerned, every signal has got some areas in the frequency band where its significant sound got its base. Make sure not to overfill these frequencies with other signals. Let your ears guide you here
You also should keep your lows/lowmids a bit more tidy (which is difficult when you have bass and guit in one signal).
An approach to this is to low cut the guits at ~150-250Hz boost them a bit above that while making some space at the same area in bass and bassdrum. Boost the bass a little at ~700-800Hz while taking the guits a bit down there and seperate bass and bassdrum in the lows (bassdrum lowcut at ~30-50Hz is common f.e.).
Be always aware of the fact that all this is just a VAGE guide and you always have to adjust to a lot of things given by your recording situation and the sound you want to have.
There is not something like the one master recipe!!
So rely on your ears
I hope this helps a little
...keep up that nice music - i like it!
Stay brutal!
Phil