I noticed a lot of the weapons do not give magic potency anymore, heck, the level 50 seal weapon for 4000marks gives a whopping +1 potency and +3mind only.
my +2 wind brand gives like 19, and an additonal +20 for wind (not counting +2).
Is there something wrong? it looks like the only viable weapon is the blue colored one at 50(is that from darkhold?) or MAYBE a vintage cudgel if it had a materia slot and good potency, I did not check the stats, but all vintage items have slots so maybe the item won't be so bad.