I'd always bring my "big rig" if I play with guys like this. You need to balance the sound of the band. If he is this loud then you have to be as well.
I played with a similar guitarist yesterday and I brought both cabs, started with the volume controls at noon, expecting to creep up a little from there when needed. My Aguilar TH500 used to clip with this guy (clipping with this amp doesn't cause a problem) now my AG700 doesn't.
I wouldn't touch the EQ if you are regularly clipping, I'd turn your bass down and let the amp deal with the volume. If you are still clipping or you can't hear your rig over the rest of the band, your rig is telling you that you need to upgrade to something bigger.
When you are playing as loud as you say, it's time to get some effective ear protection.