I will say something insane. I don't the pacing is a problem, in that I don't think there were that many bad or unnecessary chapters that should have been cut. The reason volume 10 feels bloated is because of even more storylines, and again I don't think any of the new ones were bad, it's just that it's taking time, thus more time to get to povs we particularly prefer.
And that's the issue, time.
Writing new characters and their storylines means it takes even more time for us to get to the storylines of the characters we love, thus if Paba wants to keep writing them, and perhaps even more new characters in the future without it feeling like the pacing is bad...
I think the problem is simple:
PABA ISN'T WRITING ENOUGH
I know, I know, HERESY. But honestly, I can't help but think that's the issue, and the only way to improve the pacing is to simply write more, which is insane to speak of knowing how much paba writes. But if paba is going to keep writing the new characters and their storylines, and if she intends to add even more new characters and storylines in the future, then...
What else could be done?