Ya got a booger!ok- think about this.....what does the air do as it travels the runner? Does it run smoothly into the bowl, or does it tumble? Take a stick of insence and burn it in front of the runner, with a light fan blow the smoke thru the runner & watch what the smoke does as it leaves the bowl. If it's flowing right the smoke will twist as it comes thru, like a twister, otherwise it is tumbling.
I cut the guides down in the runners on mine to keep the air from splitting so badly as it passes and causing turblence against the backside floor. I leave about 1/8" of it protruding.Just me though I like the flow.