According to the documentation, ga:LandingPagePath is "The first page in a user's session, or landing page."
So that is not useful for complete tracking of page view traffic, its more like entry point tracking.
Currently we are using v2.3 of the Google Analytics API. While v3 is completely incompatible and would take a major re-write to use it, it looks like v 2.4 is mostly backward compatible, so I should be able to update to that api without too much trouble. I'm not sure that will solve the problem but its possible there may be glitches in that version that will not be fixed. The 2.3 API is going to go away in less than 6 months so one way or another I will need to update to v 2.4.