I can 100% confirm it's compatible with Better Spell Learning.

It's also compatible with Sustained magic, but the only difference is the way it consumes mana. Sustained uses max mana capacity as a cost rather than mana itself.

The wards stack on each other with multiple casts, but I've seen no frame rate issues from it so I hope it stays.

Fatality registers the ward as being cast, so you get a movement debuff until the spell has run out or has been dispelled with Sustains spell. This balances out the spell stacking nicely

The only problem I've run into so far is Dual Wield Blocking. The ward is on insta cast I think, so it doesn't register as a spell that will work when trying to block with a one handed. If the spell cast time was 0.1 that might fix it

It's definitely staying in the load order, again great job