A minor nitpick is that for the opening statement of the Ab Major fugue of Bk II, you did not observe the tied semiquaver for the Db.
Everything is being observed here, but you are right in that I leave that Db much too soon. Somehow I had never noticed that.
Listening to the Ab from Bk. II, I was taken back by the afinity it has for the Eb Prelude of the Clavierubung (the so called "St. Anne"). The resemblence of the French Overture style with the long notes followed by the 32nds. Then there was the fugue and it hit me that its subject resembles the "St. Anne" fugue subject (which is the hymn that in English we sing "O God, our help from ages past." I'll have to check the dates for these two works to see how they compare (particularly if there are any pre-existing versions of the WTC II Ab).
Thanks for that Scott. I don't see more than a passing semblance between the Bk II Ab and the St.Anne P&F which I know well, having performed and recorded it. In fact it's just the first three starting notes that the fugues have in common, and not even in the same rhythm. There is indeed an earlier version version of this fugue, the fughetta in f major from BWV 901.