Bass traps and room treatment are always a good idea, but I don't hear a lot of room sound, or particularly anything I'd call rumble. The bass is perhaps just a tad strong (personal taste, I kind of like it). I think what people are hearing is proximity effect. You might just back mics up by an inch or 2. (Of course, then you may start hearing more room sound). I would avoid high-pass filters while tracking for solo guitar. You can always cut the bass in the mix, no reason to lock yourself permanently into a choice during tracking for a solo guitar tune.
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