The QPacks were great. Can't compare to the real thing b/c I'm taking the exam same day as you, but they "felt" more AAMC, similar to the OG and the AAMC FL.
I also thought that EK's explanations were really not very similar to the AAMC ones at all. Frustrating. After doing a bunch of the QPacks, I could tell a huge difference, and I agree the passages seemed similar but the question explanation rationales were too different to really be super helpful.
And I agree about pre-1900 materials with language that is really hard to understand, you don't really see that on the AAMC materials, so I would stay away from those b/c they probably won't be all that representative. Since your test is so soon, I'd really focus on the QPacks and really focus on reviewing whatever you miss and get used to the AAMC thought processes. And the OG and FL if you haven't already done those.