1) Turn your mids up. You have cut most of the frequencies that can be heard and only left tue ones that can he felt. As such, you're totally at the mercy of your environment.
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Yanking out all of your mids is a bedroom tone. It's no good for the stage. Put some mids back in and stack your rig vertically. You'll be a happy bass player.
I like this point about the mids. It's been a long time since I played on a decent sized stage (and it wasn't a bass then either), but when I practise I simulate the sound of an open stage because it's good for the sound, makes it easy to go for long periods. The bass snaps and snarls like it should (Stranglers fan here), but when I listen on room monitors, sat in a comfortable chair, the first shock is how nasty it sounds till I cut 12 dB or more in a null at around 1400 Hz.
I need mids to hear the pitch accurately, when playing. There seems to be some correlation with this observation in a simulation, and in a real staging.
The other thing that occurred to me is that if stands had some crank thing, with everything sat on big prongs like on a forklift, then the boundary effect could be finely adjusted without moving the heavy gear across the stage. I bet someone could sell that.