I like this stuff. Has turned my mind back to a possible AoT supplement Assabian Rites with a whole bunch of novel magic in it from the cradle of sorcery.
Forget would be a pretty powerful spell. I wonder whether the Duration would affect how much time back from the point of casting is forgotten, or how long the loss of memory lasts - the other perhaps scaled by the Intensity (Grimoire/10). Perhaps it is a charm, like Temporary Enchantment in Spellcom/Arcana of Legend, which is permanent as long as Magic Points are dedicated to it.
Read Passion - like that too. Perhaps at low levels of grimoire skill (say 01-25) it reveals that a person has a driving Passion, and whether it is positive or negative (Love/Loyalty vs Hate), at 26-50 it tells you specifically what it is, at 51-75 it reveals the % value, 76-100 it tells you why they have it. Or something... (this all off top of my head and may be utter nonsense).
Awkwardness - perhaps that reduces target's CHA based skills by 5% per Intensity, and also increases their fumble chance by 1% per Intensity. Maybe it's one skill per target, rather than one person affected?
For court intrigue magic does need to be concealed - this depends on whether magic is visible when cast, or can be made invisible by combining with a Mask Magic type spell.
It may be there are a bunch of spells of this sort in one of the RQII Glorantha books or in Spellcom - I don't have those in front of me right now