Thermoquad vs square bore

I've tried running square-bore carbs and Performer RPM manifolds on two different 360s, one with 8.2:1 compression and the other with 10.5:1. They just didn't run smoothly at constant throttle, and they didn't idle too well. I finally had to conclude that the fuel distribution was lousy. So I switched to TQs and the Performer spread-bore manifold, with no other changes, and like the way they run a lot better. Very smooth at constant throttle and a smoother idle, indicating to me that the fuel distribution is good.