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All you hear about is how the favorites are on a roll and the books are losing business. So now my question becomes if the linemakers are so good why haven't they adjusted to make up for this odd season? Why arent the favorites favored by a few more points? Are we seeing that this week with 3 teams favored by at leat 13?

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It's interesting that you used the words "losing business" in your post. While the books have lost a lot of money over the last 6 weeks, most likely they have not at all lost the business of the favorites players. They will likely be betting this weekend and right up until week 17. What would bother the books is if these bettors took off and stopped betting. As long as a run of underdog winners hit, the books won't much care about this 6 week run because they would likely win a very good chunk of it back and maybe more. Like Tech said in this thread (or maybe another), the books are ideally after a large handle played on NFL games (hold percentage) and want to make the lines for favorites just tantalizing enough so that the books won't lose favorite bettors' business. The chance of the books continuing to get killed by favorites exists but they're willing to take that chance to win back their money.