There's a lot in this post that strikes me as inaccurate. The Inca make for great Tall civs (up to 4 cities is my definition). Their starting bias makes it very likely that you'll get very large cities around mountains for your terrace farms, and you want a high pop for science, especially from astronomy, and that bonus fades as you leave your starting zone. True, the road maintenance is great, but remember that you'll get the the free tiles inside your area, which a tall civ would have anyways, so the advantage isn't as great as what you might lose by going wide.
The thing I've found with the Shoshone is that you're almost forced into being tall because your civ borders encroach on enemy Civs before you've even got the chance to go wide.
And you're way, way, off about Poland. For starters, Poland has the ability to be strong at any type of style. Being able to combine Tradition and Liberty makes for a very powerful Tall strategy. I'm most of the way through a Deity game with them, and I've never had to declare war. Heck I was only able to build a single stables. I'm going Tall with them, and it's worked out quite well thanks to their abilities.
Your say that their militaristic building and unit means they have to go wide, but you leave out any discussion of their unique ability, which is by far the most important aspect of Poland.