Gmail Pack not Importing all emails from a Lable

I am trying to create my own version of gmail /coda powered Applicant Tracking System.
Since an applicant can apply from various source and the primary challenge, I am trying to build every new candidate profile, Column by column. Reading Data from every email and matching it to correct profile and adding up(Human Intervention) Almost automatically.
Then have some point given to him on the basis of his profile. Besides having auto reply(Thank you’s) or bulk template reply. Will try to track his email via gmass.(Use gmass email update subject line as a data source.)
Biggest issue I am facing is. Gmail is not importing all the emails in on Lable.
Any leads welcome. Collaboration welcome.