New 52 Flash help (what issues I need for Pied Piper)

So, I sort of want to read the New 52 Flash for the Hartley/David sub-plot, but I was searching and wasn't able to find what issues their sub-plot appears in. I was able to find some image captures of a couple scenes, but nothing more

So, can anyone help or point in the right direction of how to figure this stuff out?

I think Pied Piper played a part in the Gorilla Grodd warfare arc

The Flash new 52 issue 8, 9, 12 and 23

He has done almost nothing in the New 52, lol. His worthy stories are with Geoff Johns' Flash.

Wow, so few, but I sort of expected it, with how little Hartely seems to be used (from what I've read), but I'll be adding those to my ComiXology wishlist to make sure I buy them

What about David? I assume he's also in those issues, but is he in few more issues?

Wait, I looked up those issues. What issue 23 are you talking about? There are 4 listed: #23, #23.1, #23.2 and #23.3

Which issues would those be?

Yeah, I kind of figured, Hartley doesn't seem to be used that much, but I like finding and reading comics with gay characters in them. Mind telling me what issues Hartley is in for Geoff John's Flash series?

So, anymore help? Trying to keep this from bumping too far back into the page count