The circles actually have a slightly larger range so not sure why that isn't reflected in the tooltip. The actual size of the circle model/graphic that you see on the ground is the same as before since I used the same model. Also, these 3 skills originally had a smaller cooldown and were going to be usable all together but I changed it at the last moment since it was too much. I will likely change something or completely replace them.
Moonlit Sanctuary was intended to be used mainly as a mana shield, not just mana regen, since we already get that with version 1 of the skill. It's main purpose was to give a whole party a shield from burst AoE damage of some bosses and also in battlefields OR as a high mana regen circle but with the risk of losing all your mana if your hit. Originally I wanted it to only affect the rest of the party, not the Prophet, so as to not leech all it's mana and make it a sitting duck or unable to heal the party for a while, but this wasn't actually possible. I guess if it's not turning out very useful I can change it to pure mana regen or pure shield, but I kinda liked this one. I'm not a Prophet though so if you say it sucks, it sucks :P
Agreed on the mana regen skill, even though it's from the Shaman tree it should still be somewhat useful. Not sure I will make it percentage based though.
Life Font is how it is because it was actually possible with half decent passive regen to sit down and keep it up forever. That's why it reduces your regen too. It was never intended to be an actual set and forget aura like others in the game but it was the only way I could get a skill like this working. It was originally going to be a channelled spell but it didn't work out as hoped. The way I see it now, it should/could be used during heavy area damage to supplement the other aoe heals of the Prophet, but like I said about Moonlit Sanctuary, if it's not being used because it sucks, I'm happy to take ideas for changing it.
Hmm Sanctioned Grace, I don't think so really. Whilst Sorcs have their 20s plus a reset, they don't have heals and immunity circles

I would rather not change this one.
Whilst I agree with you about most of the passive skills in the game being retail and too low, I don't really want to touch them. Stats are already over-inflated with our custom gear stats and I wouldn't want to take them even higher still. The only time I have changed any in the past was to boost certain jobs that were weak. I will eventually add some new passives to the 3rd jobs and those will be more in line with the way things are now.