I've been stuck in the low 160s for months--since August actually. I kept drilling and scored a 163 on my November exam. I took a month off before getting back on the LSAT train, and I scored this after not touching the LSAT for a month. Praise God!
For those who remain in a plateau: Keep going. It will eventually click.

Hi, SBGardiner. From all the information I've gathered, it appears two pages is the most wise. I've heard submitted unsolicited materials are not received very favorably. I recommend included your top two or three articles/publications. Due to the vast number of applicant's, I do not think the officers will be reading more than one of your articles. It sounds like the requested statements are all that admission officers really look at. I would shorten the number of bullets you place under each job experience to meet that two page recommendation.
All the sources I've listened to recommend putting your education first on your resume with any awards, clubs, or major projects. Admissions officers will assume your level of undergraduate engagement will reflect in your law school engagement.
I don't think an addendum would be beneficial regarding your professional writing samples since this will be included in your resume. Again, I can't recommend submitting these additional materials if the law does not ask for them based off what I've learned through this process. I think it would be most wise to put no more than two titles of your work with an additional bullet stating (Written 25+ articles regarding X, Y, and Z topics).