This is really great info.
Currently I am using Velocity Aerohead 20F/24R on my road bike and Velocity Fusion 32F/32R. I have had no problem with either rim and the braking is good. I have no experience with wider rims but I am skeptical if they ride better. Some of these rims concern me that there is not enough material on the brake track to provide good even braking and durability. I use an Aerohead OC on my rear wheel and it has been fine contrary to your statement about offset rims. I build all of own wheels including those I mentioned above. The only issue I have had with Velocity is sometimes there is an excessive hop at the rim joint.