DISCLAIMER:
Read my profile before reading the rest of my comment!

Easy. Don't hide the activations that open the exit! It becomes a guessing game at that point (not hard but tedious) what opens the exit! Here's why:
http://www.cs2bus.com/sharedfiles/filedetails?id=292356592

You have goo and some cubes without droppers! I think you have too many cubes. Didn't need blue or cleansing gel. Did not need any of the buttons (fourth picture).

If you want further help, I suggest you have a solution video handy so I can see what solution you had in mind so I can help you get your map in a better configuration.

Try my SP map?
http://www.cs2bus.com/sharedfiles/filedetails?id=398483361
Try my COOP map?
http://www.cs2bus.com/sharedfiles/filedetails?id=376181211

It's actually way easier than it looks. The beginning portion is not necessary at all as you can portal yourself up to the ledge with the surface near the gels.

Easy. Thanks.