Really would need more info in order to offer any insight here. What tests were you writing when you got that 160-163 range? What tests did you take that you got lower than usual on? What is your favorite color?
@Sheri123 I'm glad I could help, but I definitely encourage you to try to be able to attend, I didn't do the webinar justice because Corey and David killed it! @sarahfatima28 my mistake lol, shoutouts to @stepharizona for the periscope skills!
Unrelated to theories, but an interesting article nonetheless: http://www.nytimes.com/2016/01/12/opinion/making-a-murderer-is-about-justice-not-truth.html?_r=0