I've already torn the undersink u-bend apart thinking hair (and assorted goop) would have gathered in such mass as to prevent the water from passing. There was some but nowhere near the amount that would be needed for the water to completely slow.
While I had the pipes open I ran my 3/8" snake down. It encountered nothing substantial along the 30 feet. I then poured Drain-O into the pipe hoping that would connect with the problem area and flush it through.
Nope; the sink still isn't draining at optimal speed.
Ideas or suggestions?