"The [human] species will never learn to co-exist if given total freedom."

[rva_jeremy]

I encourage others to chime in if they have a different take on this stuff, or if I'm contradicting Confederation material. Kind of going off my suspicions here.

Doesn't the veil's thickness correspond to the difficulty of achieving harvestability itself?

No, I don't think so, or I at least think it's more complicated than that.  The veil, if I understand correctly, was designed to making polarization and harvestability easier--at least in the sense of allowing for a more efficient (quick?) choice through the confusion you correctly attribute to it.  That doesn't mean every planet's veil will be equally effective.  The veil is not the only variable, and it's not simply a matter of the degree of veiling but also what is veiled.  Those of Ra have suggested there have been different things veiled in past evolutionary cycles.

It's tempting to try to form a model of how this all works, but one thing to keep in mind is that polarization may simply be a mechanism of exploration and reflection for the Creator on its infinitely various facets and aspects.  Therefore, it's not simply about tuning for maximum polarization, but about using the mechanism of polarization on a great variety of entities, some which may be quite different from us and react in slightly or greatly different ways to the mechanism.  If the veil worked the same all the time, in other words, it wouldn't really be yielding new, novel information to the Creator.

Meaning that the thicker the veil, the more confused the population is, not necessarily more negative.

That's my read. And the more confused, the greater the possibility of a choice being truly freely made--with the corollary that the choice is therefore harder to recognize or clearly make.  It's almost as if the veil is designed to handicap our greater selves, forcing us to polarize with only our hearts to guide us.  That's why, I believe, those of Ra make curious statements like calling free will the "law of confusion" and weirdly suggest that this confusion is somehow beneficial.  It's like isolating a muscle on a workout machine; you are purposely restricting motion in the rest of your body to work solely one part.

I think it's very unclear how the characteristics of the veil affect the directionality of polarization.

Those Logoi with greater negative harvests might still have had thinner veils than we, because they might have had a greater number of harvestable entities by the end.

That's a really interesting idea, especially considering the way the significator often biases positively in response to negative experience and vice versa.  Your theory would then imply that negativity might be a kind of reaction to too little confusion.  It's worth pondering!

From what I understand the veil impedes spiritual momentum - the thicker the veil, the greater the inertia in trying to start towards one polarity or the other.

Just to be clear, I think the veil is at least intended to enhance momentum by creating more intensely polarized experiences.  However, I think it simply doesn't achieve this perfectly in 100% of cases.  I always return to the mystery inherent in all this, the idea that all of this constitutes a foray into the unknown for the Creator.