Hi Randy. You will want to experiment a bit but seeing how you are starting with such a nice graph I would leave the 600 where you have it currently, maybe move it more into the corner for the extra output then walk the mic around to see what gives you the smoothest response at the sweet spot. Might even be worth trying both up front in the corners, in light of your large irregular room. I'm sure you will find the right spot by walking that mic around. A 350v3 should mesh well with the 600. Also if possible, I'd try to find a spot the distance of the 600 less 3 feet to get the time delay aligned. You are still going to have to compromise a bit to balance FR across the seats but it should be smoother for everyone.
