EDIT: you should change one of the kurio manas to creation, Grigori to force, illian to ice and sheim to dimensional. and other fitting civs, like doviello should also have ice, and maybe ljosalfar should have creation.
I agree, except I don't really think that the Ljosalfar should have creation mana. Creation is a youthful sphere about fertility and new life springing up, and the Elves traditionally have a very low birthrate to go along with their longevity and eternal youth.
The Compact was Dagda's (well, originally Cassiel's) idea, and is frankly the epitome of his sphere of Force/Balance; thus, the Seven Pines, as the sight of its signing, really needs to have its free mana changed from Enchantment to Force. Enchantment never really made any sense here, imho, so I always assumed it was just a placeholder until Force was implemented (although Law would really have been a better stand in).
Letum Frigus needs to give Ice mana now that Ice mana has been implemented. .
I'm thinking it could be good to add the Bair of Lacuna unique feature, which should grant dimensional magic, which should have some special bonuses for the Sheaim and for the Calabim.
It could be nice to add a Creaton mana providing unique feature too, but I haven't thought of a good one yet.
I personally like making Maelstrom give Air mana. I was a little surprised at first to see that it gets properly connected once it falls within your cultural borders.