Hey there!
Actually, the current raid system is still very much in the "prototype" stage. The skeletons have gotten smarter, but for them to become truly "organized," they need to go through a bit of an "evolution" as the game progresses. I think that instead of just increasing their numbers, they should start getting "leaders."
I also want to add more "world" threats and certain penalties (for example, bandit camps spawning near the kingdom if the population remains unhappy for a while).
Thanks for the feedback and these great ideas! I'll also look into the Crystal Harvest Post issue you mentioned.