Third, and this seems to be lost on so many sound men now, is that I can carry the room, I don't need to be in the PA, let the PA be for the vocals and drums and keyboards, and mix the guitar and bass up as needed. Going back to point one, when a sound man starts the conversation with what I want, I'll usually ask for them to use my mic (I always bring one so I'm not putting them out to find one), and then say let's work out a good volume for my rig, and then you can fill in as needed with the mic. That method has absolutely garnered the best live sound when I play. I turn my rig up to where I want it, we see if that's a good point to fill the majority of the space, make some tweaks (little louder, little quieter as needed), and then he REINFORCES that sound if needed, because that's the purpose of a PA, sound reinforcement. Enforce with the amp, reinforce with the PA. Many times, I'll talk afterwards and they'll say they left me out of the mains entirely and just used the mic for the monitors, and that it was an exceptionally good sound. Often when the PA does the heavy lifting for the bass, it and the bass drums get too muddled and boomy, but when you Mic and go with the amp carrying the room, you don't end up with all that excess low end excursion that the PA is capable of. It also gets muddled up in the mids where they overlap, but the cause is likely because while the sound man sets the levels of the mix in the PA, they don't do too much EQ'ing, so especially off a DI, you might just be getting everything with little EQ, except maybe to tame the highs.