[Autumn]

Instead of nerfing the seeds out right, why not put a limit on how many of each sub-type of seed you can slap onto a weapon, making it so you can only put 1 Lord-line and 1 Wild-Line damaging seed on the tome, perhaps even bumping up individual numbers in the process to make sure that slot is worth it.

For reference, a custom spell with 1 large damaging seed on it should sit at roughly 125/175% Elemental ATK 100% SWA, and a lot of the status seeds are terribly under powered (Looking at you poison hex seeds) so these could use some bumping up as well.

This also makes it so you don't need to bump down the scaling of the tomes, and perhaps readjust the defensive ones to being 80%/40%

So here's what I think:

Noble-Line seeds should sit at 125/100/75% of your Elemental ATK (Not ignoring protection or armor)
Wild-Line seeds should sit at 175/150/125% of your elemental ATK (Not ignoring Protection or armor)
Poison-Line Curse seeds should be LV 30/20/10 Poison, currently sits at 10/6/4
Acidity-Line curse seeds should sit at 15/10/5 Acidity, currently sitting at 10/6/4

This would make it so the maximum elemental scaling you can put onto a spell is 275% Elemental ATK, but doing so makes you eat the Wild-Line's akashic damage, otherwise your elemental spell will generally be upwards to 125% Elemental ATK + additional effects like poison/acidity/charm/knockdown etc.