We find this to be a myth. This is not true at all. In fact we find a small rig to be less plessurble in the fact that the banger is so close to your face. We suggest a rig that you like. One that is comfortable.
Why do people say a smaller rig tastes better. Well, most blowers just can not make a larger rig. That may or may not be true. But what we do know is no matter way, even a larger rig, is still small compared to say open air.