11...Bh6 might have been worth a look. Not a move that leaps to the eye, of course...

We could have had a quick draw.... 12. Be3 Bg7 13. Bd4 etc

12.Bc4 looks more (safely) aggressive.

I was afraid of one of his rooks coming to c8 with tempo attacking c3 again. I was aware that my Bd4 could be booted anytime with e7-e5

Possibly 12...e5 offered more interesting prospects. E.g.: 13.Be2 d5, with the idea 14.exd5 e4! and a strong attack going.

For the time being, d5 and d6 are weaknesses White is in no position to exploit. But Black has to play actively to make good on this 'positional sacrifice'.

This bears a similarity to a line I suggested a few moves back. Is it as good now for Black as it was before? In the earlier line, the White knight stood at g1. That might have made the difference for Black.

14.c4 was the best move in the earlier line as well, offering the exchange of queens. Black would have got his pawn back, and White's structure would have been no less ragged. Black might have attained the whisker of an edge. The knight on e2 now stands available to protect the e-pawn.

There seems to be a reasonable alternative in this: 18.c4 Qxd2 19.Bxd2 ... Now 19...Nxe4?? gets the chop by 20.Bxe5, winning a piece. Instead, 19...Bxe4 preserves a dynamic equality: 20.Nxe4 Nxe4 21.Bb4 ... Black's best here seems to be 21...Nd2!