Your plan sounds good, that's what I'd do as well.
The changes made on the different AIs are too numerous to list, keep in mind that we branched off the standard AI over a year ago. And DAIM isn't that much about simply modifying the AI, we rewrote many parts of it entirely to fit our liking.
Our plans were to finally release a new version this Friday, but due to Spocky's computer breaking down (our main test machine) this is unlikely to happen now. And then I'll be away for over a week, so we don't know yet when the next release will really happen.
What has been done already is a lot of fine-tuning compared to the last DAIM version: Japan is doing a lot better and landing all over the Pacific almost reliably. The UK has been redone as well, it had some kind of a bug in it which often prevented it from developing its full strength. Italy got some tweaks as well. (These three are Spocky's domain.)
I redid the Soviet files because I was disappointed and somewhat surprised that they always loose against Germany. Their setup is better now, but they still loose. I also changed a couple of details in our files for Germany and the US, but nothing revolutionary. I'd really like Germany to do Sealion, but they always manage to scrap their fleet with extraordinary speed and thus cannot land anywhere. Similar thing with the US: They land in the Pacific area, but very rarely elsewhere, and they loose a lot of (unescorted) transports doing it. I couldn't find anything to do for DAIM China.
Right now, my main goals are the following:
(1) To enable the SU to win against Germany (without weakening Germany, of course).
(2) To get the stubborn US to land in Europe as well (they made a series of dream landings once).
(3) To enable Germany to make Sealion (before it trashes the transports...).
I'll welcome anything helpful, be it observations or constructive propositions.