Storyline Zoom Region trigger Layer w/o button

I am trying to zoom in on different areas in my base layer and would like the timeline to trigger each layer with information without the user having to click a button. Here is what I would like to do:

Base layer plays and zooms in on region which triggers Layer A when the timeline reaches a Cue Point. (I added a second Cue Point after the Zoom Region so it Zooms out to where it should be as well.)

Layer A plays until end of timeline. That layer then should trigger back to the base layer (or user could use a back button).

Base layer resumes on timeline and Zooms into Region B, which triggers Layer B using Cue Points similar to above.

Layer B plays until end of Layer B timeline and then triggers back to base layer (or user could use Back Button. 

Base layer resumes and Zooms into Region C , triggering Layer C, etc. 

 

I have added so many triggers at this point, and tried so many combinations, but I still can't seem to find the right way to do this without using buttons on the base layer.

 

Is there a tutorial showing how to use the timeline and cue points without buttons to Zoom in and trigger layers? Right now it's very choppy and clunky.