Well, the way I look at it, If I can hit "render" and come back to a finished image the next day, I'm not too worried about mostly unneeded effects if they do help somewhat. Since this still falls in that threshold, it's alright, but I'll keep it in mind for future renders.
In the meanwhile, I may call this final, as it's looking good. Tweaked the contrast a bit and added color variation to the populations as explained by TU I believe.