Just to make sure, you're also aware of Owlcat's Pathfinder: Wrath of the Righteous, right? It's not out now (currently in alpha available only to kickstarter backers I think...), but it should be out in a year's time or so (idk).
From what I've seen others post, it's pretty good so far.
Yes P:WotR should be hugely improved in many areas over P:Km.
In addition to the two Pathfinder games and Solasta, there is also Realms Beyond which, like Solasta, is using the D&D SRD but 3.5e instead of 5e.
