Personally, priority wise, I beleive something to address TP moves that are actually happening need to come first and foremost.

Something that addresses the damage dealt in particular for high damage or AoE type attacks are preferable. TP Reduction spells are already in existence, and Addle does provide some magical accuracy loss.

But there needs to be a stronger presence against the actual moves/attacks themselves and this is where we're lacking the most, defensively.

I would, however, like to see a revisiting in offensive debuffs. Things that reduce Magical Defense, or increases the Rate/Damage of Critical hits based of of a magical debuff in spell form would be very welcomed as we don't have much aside from Dia tiers in terms of increasing damage for the party.

It would also regard issues in our support/buff line where we run into the debate against cycles, spheres, and aga spells. If we had debuffs that helped offensively instead of a buff, we'd have a stronger support role for HNM game just off of that.

Most importantly, these debuffs need to be RED MAGE ONLY Sharing them with other jobs is what takes our specialty away from us, SE. Saboteur is not enough to handle this issue.

Pretty much regarding TP attacks, however, is first priority. Something that's passive and allows the TP move to happen, but to noticeably lesser effect overall. After that point our library should be ok to slip into more offensive enfeebles.