10...Ne8! Nice.
There is a detail in Keene's Nimzo-Larsen book that I am not remembering and for various reasons I don't have time to look it up in my database. Some line with c2-c4, c4xd5 ...e6xd5, and at the right moment d2-d4. Black can choose between IQP or hanging pawns but I concluded this version is annoying and black should avoid it.
Keene wrote some quite good books before going over to the dark side.
For a few years the Tarrasch was my main defense. It can be played against almost any white flank opening, but there are some move order issues. You can't just close your eyes to what white is doing. A couple of examples.
Nimzo-Larsen. 1.Nf3 d5 2.b3 c5 3.e3! Nc6 4.Bb2 Nf6 5.Bb5 is a healthy reversed Nimzo-Indian for white. I don't remember the details, but I do remember concluding black should avoid this, and my formula was only to play ...c7-c5 after either white already played d2-d4 or black already played ...O-O. So, 1.Nf3 d5 2.b3 Nf6 3.Bb2 e6 4.e3 Be7 5.Be2 (5.d4 is a reasonable Colle-Zukertort for white) 5...O-O 6.O-O c5 etc.
English-Reti. 1.c4 e6 2.Nf3 d5 3.g3 c5 4.Bg2 Nf6 5.O-O Nc6 6.b3 Be7 7.Bb2 O-O 8.e3!? Keene in Flank Openings calls this a Neo-Catalan. This is a real system, recommended in Soltis's Winning with 1.c4 (or maybe it was his Winning with the English, he wrote two different repertoires). White's idea is Nb1-c3, c4xd5 and d2-d4, with pressure on d5, the same as a Tarrasch. Of course if white had played c4xd5 anytime earlier then black would have taken back ...e6xd5 and now could just develop the bishop. In a pure Tarrasch IQP move order black would meet the double-fianchetto with either ...Bc8-g4 or ...Nf6-e4 (or both), but that's not possible here. So 8...b6 9.Nc3 and here 9...dxc4! is the move, but to play this black needs to know two things: (1) How to answer 10.Ne5?!. (2) How to play the middlegame after 10.bxc4. It's not a Tarrasch Defense, that's for sure! But I didn't find any better system for black if white plays this way. Keene quotes quite a few games, one to start with is Timman - Spassky, Sochi 1973.
The first one is just a normal, unbalanced position after 5...Bd7, which should fit Black fine.
The 8.e3 line in the Reti is nothing to worry about. I played this position as Black in a high level correspondence game, and I used an old idea that the late Efim Geller had showed us (10...Ne8!) which gives Black a very good game without much effort.