Why don't you write a bit more about how you approach situations? To be honest, I think that's the core of the game.
For example,
If I had pistols, and I saw a hell knight in the middle of the room on an early dungeon level, I would do...
If I were using shotguns, and I saw a crowd of Barons with an Arch-vile, I would do...
Also, talk more specifically about using cover, using doors, and sidestepping. These three things probably are skills newer players really need. Also, I think that hoarding medpacks are a bigger problem than using them too quickly for many players...all those mortems with medpacks in inventory!
For example, situations like these are relatively high safety cover positions:
..#....
../...B
@.#....
@........
##.......
.#.......
.#...B...
Since it looks like I disagree with you on many things, I'll probably write my own guide in the future, so players can learn from two different viewpoints and adopt what works for them from our different playstyles. My style really focuses on using cover, and I pretty much play only N! (and less often UV) pretty much all the time, which punishes choices that would have worked otherwise. When I played a HNTR game to see how quickly I could complete it, I was struck by how careless I could be. My style is also probably why I stink at AoB and AoPc that much - I'm not good at getting close; I try not to.
I think the best way for a player to get really skilled at the regular gun-based game (not AoB or AoPc) is to play AoMs. When you make a mistake in AoMs, it leads quickly to death, so you identify it and remember it. If you're playing other modes and you make a mistake, you might use a large medpack or pick up a supercharge and end up never really considering that what you did was a risk that you should have tried avoiding. Also, if you can beat AoMs, you can beat everything else on the same difficulty level (except perhaps AoB, AoPc, and Ao100). All skills learned from AoMs work for everything else, but skills that have been learned on other challenges don't necessarily transfer.
Oh, and the last 80 floors of Ao100 being like floor 20? There's 3 times as many enemies in the same space, so it's not exactly alike. And 3 times more archviles in the middle of 3 times more other high damage monsters is way more than 3 times the danger, so I'd say there's a hell of a lot of difference.
