This is fine. It's still odd to me that my London bishop is really the good one.

This is a flexible move. Turns out that the engine thinks it's fine. I don't necessarily need to play it right now -- b4 is not coming for a long while. Part of my thinking is to see what white declares in terms of castling or pawn structure.

I'd rather play an e5 break than a c5 break.

b6 was also good.

b6 is fine, as are Rb8 and axb. Your pawn break wasn't bad, but you do have a habit of rushing them.

!? An interesting complication with not a lot of downside. Black has no serious problems even if black manages a painless exchange.

There are a few ideas. Black is going to take the b-pawn, first off, and white is obliged to capture or else the extra c-pawn takes some time to round up. I didn't properly appreciate the trade of a queen for two rooks, but black's game is great. The rooks probably live on the d and e files, (e7 and d8, perhaps).

?! As above, not quite as good as the exchange of queen for the rooks. This should be about equal after 19. Qd4!

These variations are quite forcing. Black is headed to a great endgame.

This will be a win with proper play. Black's technique wasn't the best though.