(For reference, I'm no Kaladin fanboy, he is fine, but just that)
While statistics is great and all (its about 50% of my job), I think that your strict analysis has a flaw @LerasiumMistborn. It sounds like you assume that screen time necessarily implies import or growth. In OB, Kaladin is on screen the most, but undergoes much less growth than in books one and two. He acts in some spots as almost filler, for the dramatic timing of Dalinar. X amount of time has to pass before Dalinar gets his next memory? Let's watch Kaladin do some action stuff and resolve some old plotlines. Shallan definitely does the same in OB, with much of her viewpoint being a rehash of the same issues.
You also have to have realized, there is always a main character. These aren't strict GRRM or Tolkien, Sanderson always has a main focal point. But like Vin and Sazed, the former getting more screen time doesn't make the latter less important.
If I had advice to give, it'd be to pull back and be a little more cerebral. Look at the Kaladin sections and woder why they are there. Might make them more fun?
As for my gripe, it relates to the dropped Listeners. I wish they had seen a more graceful descent into storage, but there is already a thread somewhere about that.