If you do not know how to limit your search results to the GS forum, see this post in the Feedback section:
The short post is from months ago, but the easy trick explained there still works, of course.
I purposely am not copying and pasting the post here -- in order to encourage you to explore other parts of the GS forum. Enjoy.
gkelly has given some very instructive explanations of scoring. The thread at the following link has helped me:
So happens that just this week, gkelly gave a great explanation of factoring (see post #10 at the link above), including the desired balance between TES and PCS. If Mathman had not been kind enough to come to your rescue right in this thread, the References section also had the answer for you.
Agree also that GS has an abundance of extremely knowledgeable members who are very generous about sharing what they know (and/or what they make a point of researching).
Among those with lots of patience and goodwill are: Mrs. P, Mathman, gkelly, dorispulaski, and CaroLiza_fan. Their names are just a few that came quickly to mind, and you will discover many others.