Honestly though I don't see any problem whatsoever with the generic Ikisith tomes coming after codices of power in terms of progression/best AA usage.
I agree with this and I want to piggyback on it with three points.
The first is that experience should be essentially unfinishable. Whatever means this is achieved by is probably okay, including increasing the amount of AAs for smaller benefits to players. I think this because, numerically, 1% at the point where you have finished codices and have good gear is still significant, probably enough to visibly notice in your damage window. Additionally, if experience is finishable then all characters are essentially racing towards being identical (this has always been eq in a nutshell and sod, but it would be nice to break away from it somewhat)l. I hope that eventually tomes will be ubiquitous enough that players will actually
choose where they invest their time, and so distinguish their monks from other monks based on personal play style.
Another reasons ikisith tomes should come after tomes of power is that 4% increase in strength for *most* classes for 200 AAs is still pretty enormous, especially considering the wide ranging effects of those tomes. In order to incentivize players to use ikisith tomes before codices, you would have to drop the AA cost on the crit strike tome pretty far, probably farther even than to 45 AAs. At that point I personally believe you are getting better too fast
and this was a big part of why the codices were nerfed.
The last reason is that generic tomes are, as far as I've seen, exclusively bonuses in power. Power bonuses are not necessary to complete content, or at least they probably aren't since it seems unreasonable to ask players to complete most or all of these simply to finish the game. If the generic tomes are very expensive, they remain as bonuses; if they are cheap, like AAs, they become necessary (which isn't as fun as a bonus). I believe that instead, class tomes ought to be significantly cheaper than generic tomes because, in general, these will be more class-defining and somewhat necessary to progression, and overall class tomes will be a lot more fun than generic tomes. This way you leave the small bonuses to the people who really do want to sink thousands of hours into small advantages, but make it not-so-hard for players to enjoy the full scope of the content without unlimited time to spend.
TL;DR
1) Experience shouldn't be finishable if at all possible because if it weren't then players could make choices to distinguish their character from other characters of the same class.
2) 4% bonus to everything for 200 AAs is SO big that if you reduced the amount of AAs on generic tomes to incentivize players to finish ikisith tomes first, you would have to reduce them so far players would be increasing in strength even quicker than when codices were 5%,
which was a problem.
3) Generic tomes should be long and class tomes should be short so the mccoy has his timesink and the semi-hatfield's still get to enjoy the class-defining content.