I would have thought that passing fluid through a thinner vessel means relatively less fluid ingested over time. This means if you drink the same amount but slower, the same amount of alcohol is able to pass through at a slower rate meaning more of it has a chance to be absorbed into the blood stream.
Scrunch up two paper towels into a ball, then throw a cup of water on one and on the other one slowly pour a thin stream of water. You will see that there is a lot of wasted water around the first towel, this is because the rate of absorption was slower than the speed of the water. But the towel you're slowly pouring on will absorb all of the liquid because the rate of absorption was faster than the speed of water. Now when you drink fast, you're drinking faster than the rate you can absorb nutrients, it will absorb some of the drink, and once you're saturated it will flush out the rest.