I don't think I'm alone in being slow to reply to my messages. As with many things DIY, we've got jobs, kids, and spouses that don't want us to screw up anything we do to be helpful. Thus, our jobs take more time that it would if we were paying someone!
As far as our drains are concerned, we have been motoring along. I have used bioClean every once in a while. Also, having my wife cut her hair short seems to have helped. We are renovating the adjacent master bath now, and have decided to pay the plumber to upgrade the drains to larger-diameter PVC.
Thanks for your help!