I've just read through this thread over the course of a few days. Here are my thoughts:
This TL illustrates the fact that just because a period of history is thought of as "overdone" or "clichéd" as a setting for AH does not mean you can't tell an original story. This TL really captures the uncertainty of the early days of WW2 and is refreshing change to what can often be a climate of determinism on here as far as WW2 is concerned, that no matter what you do, things will eventually end up looking pretty much like OTL. History is flapping loose here, to use the Discworld phrase: we can compare the German salient in Paris to Stalingrad, but nothing here really resembles anything recognisable from OTL. This isn't a different OTL bit of history transplanted into place like some of Turtledove's works, this is
real history, one thing happening after another with no-one sure where it'll end up. Very reminiscent of those day-by-day, blow-by-blow accounts of WW2 you can find.
When you wrote that the German surrender took place at a Paris Metro station I was wondering if it was the one that would be renamed Stalingrad in OTL, but alas not
Besides Stalingrad though the Germans' situation is also somewhat like the British after Dunkirk. Except they have lost many more men and don't have the luxury of being an island.
You have done very well considering this is a period of time in which there are lots of people with detailed expertise about particular areas who can and do argue about it forever, you have defended your decisions and judgements well. If I would make one criticism, though it was interesting reading through such discussions in this thread, the fact that the TL tends to be written in short bite-size bits means that it is a hassle to trawl through the thread to read it: a text only version in the TLs and Scenarios forum would be much appreciated.
To finish I will say that I have just voted for this TL in the Turtledove poll as a worthy winner and I seem to have helped pushed it over the post, as it's currently leading by two votes...
(Oh, and I was very pleased when you used the phrase "Daring Commando Raid™" at one point
)