3. "Does Asics still have a lot of year-to-year variance?" In response to In response to 2
I used to run in a distance ancestor of the 2100. The next iteration of it was a huge change though. Stiffer upper made of literally different material, bulky tongue, somehow wider. All things that could have made a better shoe for a different runner, but why not just create a new series if there's going to be that much internal variation from model to model?
Though the easy solution to this is that when you find a shoe you like, buy a bunch of pairs.
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"Walleye, a lot of things are going to go wrong in your life that technically aren't your fault. Always remember that this doesn't make you any less of an idiot"