11...e5 looks almost forced to me from a principled perspective, given that 11...dxe4 is not possible.  

I've also found that Bg5 can be an annoying move to face in many of these Paulsen/Taimanov lines; here's one example:

 
It's important to always have something good planned in response to it, especially when you've already castled and are "out of book."  Chalk it up to experience gained and move on. 

gewgaw wrote on 11/07/17 at 17:28:18:

After 11...Be7 12.O-O-O b5 it seems to me like Black has a good Richter-Rauser.
Compare 6.Bg5 e6 7.O-O-O Be7 8.Qd2 a6 9.f3.

Yep, looks good, but still not clear, if White plays Bg5 instead of castling.

Hi there,

sometimes you play an opening for a long time, but you still don't get it:

1.e4 c5 2.Nf3 e6 3.d4 cd4 4.Nd4 Nc6 5.Nc3 Qc7 is well-known, then my far weaker opponent played 6.Ndb5 Qb8 and 7.Be3 a6 and now no Ponomariov with Bb6 but 8.Nbd4 Nf6 9.Qd2 Bb4 10.f3 d5 11.0-0-0 0-0 12.Bg5 and I fell in deep thought for more than half an hour, because nothing really worked or looked unpleasant for me.
I finally came up with 12. ...Be7?? and saw immediately the refutation, but my opponent overlooked it, but I still got a bad position.
So where should I improve my game, actually I still don't like 12. ...de4 to ruin my king's position.
A move like 8. ...Qc7 is of course possible, but there must be something better to use White's waste of time.
Any ideas?