They're all fine except for the Luchuirp and Lanun ones, which need tech requirements, even very early ones, to reign them in. I know you're going to make the Luchuirp one require Masonry, which by my own tests with that requirement works great. Lanun one needs something similar.
Might as well voice why I think some of the complained about ones are balanced:
Ardor would be overpowered on any civ except for the one it's on. Considering the Grigori's drawbacks and how little a hero swarm helps after the early game, though, it works for them.
Hyborem's Whisper and Divine Retribution are tools for the latecomer civs to get a foothold. I approve. If you don't want to be screwed over by them, don't use AV, and don't rely on demons to comprise your army.
March of the Trees is sick on a specific maptype, one where you're surrounded on most if not all sides and don't need to use your economy to build the foundation of a naval assault and don't have some huge rival that you need an economy to outrace. Such situations are rare enough, IMO, that the spell is balanced. Like, if you're playing on a decent sized pangaea, you won't worry about the first two things, but there will probably be some runaway AI who takes a bunch of vassals and has buffer states between you and him, and you don't want to throw away your economy if you have to eventually deal with someone like that. And WTH, the AI sucks with march of the trees. Just turtle up your border cities, declare war, and waity 5 turns before attacking.
Sanctuary's fine on normal speed, the speed FfH is balanced around. Make it scale to game speed or not, I don't care. It's not like I play any speed other than normal these days.
For the Horde's use is unintuitive, but great - it's like a free version of Marco Polo's Embassy or the Empath Guild. It's actually kind of worthless as a military augmentation though, since it gives you crappy units which are all spread out and that drain your treasury. Deleting the ones that are far away from your empire is a good idea. For that reason, it's balanced, if one of the better ones.