Clovenhoof: You've summed up my opinion better than I did, I think. I don't mind the glitchiness above 10th lvl because (a) people rarely fight their clones and (b) because to me RPGing isn't a mathematical model or some equation that needs balancing. I think it should remain unbalanced to some degree, because, as Hoof just said, Barbarians should fight better than Nobles, no matter what level. I thing D&D4 is a pile of lump because it evens the playing field so much that nothing is interesting anymore, and that's what I feel that equalizing the bonus line so that everyone has the same progression is going to do. Now, if that's the kind of game you like or it makes your Conan game work better for your group, then great, but I see it potentially unravelling more things down the line (feats, skills, spells, etc.), or at least raising more questions than you're trying to answer.
Warma: I didn't mean to sound offensive, so I apologize if you took my "anti-math" comments that way. I stink at math and play RPGs to not think about math, almost specifically (lol). Yes, things won't work mathematically, but things in reality don't all the time either, and they especially don't when operating in a fantasy world. I'm okay with that, and don't seek empirical answers or balance where I don't feel it's needed. Ys, I see by your models that attack bonuses get high and allow for easy hits, and defense values stay rather low and allow for more hits to connect. But all it sounds like to me is that you delay the levels in which classes gain additional BAB (so attack doesn't get so high) or you increase defense bonus opportunities, as Hoof mentioned.
That's where I get with players and develop new feats. Maybe there's a feat that allows INT bonus to add to DV. Or WIS bonus. Maybe even CHA bonus, if you word it right. There are already feats and skills that undermine the direct Attack/Hit/Damage procedure, and that's where I'd fight the battle the Acheronian Edition is trying to fight.
The most obvious example of what I'm talking about is Sneak attacking after an Improved Bluff. It creates a situation where a physically weak character with low strength can kill a huge dude with one Finessed attack. Why not compare 10th lvl clones of each class and then create a new edition, or show me the math then. Right now it seems a lop-sided argument that hitting and killing clones of one's self is too easy. It's just as easy if casting Pull Forth the Heart, but nobody is doing the math on that.