You need to remember that as you start to go back and fix this, that there are a number of items that you changed.
I personally don't think making it responsive had any downside for you, google has made it clear that traffic will drop for sites that don't show up well acrossed a wide range of devices!
Now going from 20 pics to 5 to 15 minute videos of course is going to have a major impact on your click thru rate. Why would they want to go a look at anything else when you give them enough to pump one out ?
Not sure what software your using to run your site, but maybe try having the top 4 links into a tgp page like you used to have. Run this for a week and see what your ctr is on those 4 pages. Mix it up also, the top 4 on your site now all link to nubile films, should have a mix on your entry pages. Within the pages themselves it's ok to use channels or related links to show the stuff from the same sponsor, but where surfers are coming in you want to show them a wide offering in your niche.
Good luck
