This is similar to my experience.
When nuking normal, low~ish level mobs against their strong element, resists do happen more often than usual. I don't recall the resist rates against low-to-normal level mobs, albeit a bit higher, even approaching the high resist rates experienced when nuking high-level NMs against their strong element (for example, thunder nukes against Dragua).
That's what happened though in Spring 2009. It wasn't limited to just enfeebling magic.
I've said before that the adjustment to magic resistances really does make sense, but I've also opined that this sort of common-sense adjustment came too late considering that FFXI was a matured MMO in 2009. By that point, players had invested too much time in their character and equipment for SE to make such a drastic chance to the magic system's mechanics and expect players to happily accept and adjust to such a change.
If SE had made such a change in 2003 (even into 2004), I think everything would have worked out alright.
