Thanks for the shared analysis!
Against the Austrian with 6.Bd3 & 7.0-0 I almost exclusively played 7...Nc6, but sometimes the tension in the center fizzled out a bit too soon for my taste and it seemed difficult to avoid the outcome with Black.
7...Na6 is of course a very worthy alternative (and I think today even Mainline), as it generates a more strategic and dynamic middlegame fight. So I recently included it in my repertoire and got complex games, experience and feeling for the arising positions still need to be established though.
When I looked up your book references and refrehed some of my notes, it seemed that 9.Qe2 and 9.f5 post the most (practical) problems for Black - 9.Kh1 (very popular) and 9.a3 (maybe rather played as an SOS on move 6!) I wouldnt consider to be too dangerous.
In general, when Black is able to play both ..Rb8 and ..Bg4 (9.f5 is stopping this of course), he should be quite alright in my opinion, although 9.Qe2 as it prepares e5 and stops ..b5 has to be taken seriously.
Will be interesting to see, how further authors will evaluate these lines in the future!