Abyss 17 + 1 = 18
Arborea/Olympus 15 - 2 = 13
Arcadia 12
Baator/The Nine Hells 18
Beastlands/Happy Hunting Grounds 21
Carceri/Tarterus 14
Elysium/Blessed Fields 20
Gehenna 6
Gray Waste/Hades 6
Pandemonium 5
Ysgard/Gladsheim 20
Maybe if we make Dionysius a major god (thereby distracting all the others for a good long while) ...