o_O I love when people post how they only want x-type of people to reply, as in that people trying to do you a service is somehow wrong if you didn't ask for that type of person. Hmm..
Anyway, I'd like to know here that when you're comparing stuff, are you comparing the US rom or JPN Easy Type? Have you also considered the possibility that the translation you're using for Easy Type could very well have also included some hacks to the game play and should NOT be a benchmark?
You also don't mention any levels when you're talking about the damage, which makes them meaningless. As you know, your level and equipment will greatly affect how much damage you give/take. Since your equipment is limited by these battles, I'm curious how high/low levelled you were at the time.
Also, if you think that the patch may be involved, why don't you play through FF IV JPN (hard-type) in Japanese (just jab at the proper button, you have to know the plot well enough to bs it) and see if the dmg levels are the same.