My experiences...
I'm entering week 7 and yes, items confiscated can vary slightly from platoon to platoon. They'll search your luggage and will at some point explain things regarding medication and how to access it if you don't have it/have it taken away. (I can't remember when we got our spiel about this.) I don't believe anyone in our platoon had their Advil/Tylenol confiscated and no one was trying to sneak it in.
Pack lightly. As lightly as possible. You'll probably end up buying stuff while you're here anyway. Stick to the list(s) precisely, for item quantities marked with 'X' don't bring many. 2-3 max. (Regarding the list your RC gave you, there are things on it that you may not use...at least the was the case for us.)
Don't bring starch. They want you to use what's issued at the Canex, so everyone has the same item. If you want to bring an iron, go ahead, but there will probably be enough in your platoon for sharing.
DON'T bring a ton of civvies. You just don't need them. I have 2 outfits. They've been plenty. Socks and underwear? I have a week's worth, and I've been more than fine.
Yes, enjoy the stairs. You'll figure out quickly that even though it only says 4th floor, you need to add two flights to that...you'll understand why when you arrive.