Reasonable Perfectionist: When you said you use a fernco to connect to the strainer basket with a tubular PVC tailpiece do you mean that you put one end of the fernco on the threaded part of the strainer basket and the other on the tailpiece?
I'm planning to use the Kohler 8801 drain (which Rex Cauldwell recommends) which has a rubber washer instead of the plastic washer and it provides very little obstruction/crud catching potential. (It comes with a brass tailpiece.) I inspected another drain with the plastic washer and it seemed like the washer is huge, and would get dirty and trap dirt and be hard to clean. (And the washer blocks about 30% of the drainage space.)
There seems to be a preference for end outlet waste over center outlet. Does this apply even if I have a 15" space between by drains? I believe the disposal is about 4" radius so I'd have an 11" run from the disposal to the end outlet baffle-T.
In my case, over five years living with the existing setup which features an S-trap I have noticed every so often a bad odor coming from the sink. Not very often, but occasionally. I have been assuming that this must be a result of venting issues. Because we use the sink constantly the trap will presumably get refilled fairly soon if it gets siphoned empty, so this problem would tend to go away, as indeed it has. I figured an AAV would cure it completely...unless there's some other possible source for the odor. But why does the AAV need to be as high as possible? I thought it just had to be 4" above the water level.
In my house I'm connecting to 50 year old 1 1/2" steel drain line, so I can't assume that I have totally clean 2" drain lines. (I got a look at the line when I replaced my utility sink, though, and it didn't look too bad.)