FFVI: Alternate History

I don't know that 'more = better', necessarily, although obviously you want enough changes that it's a new experience, to whatever degree. The thing about game balance/challenge is that it's not necessarily about 'stronger monsters/weaker enemies'; depending on how you handle things, different is sometimes a better solution that stronger (or weaker), unless you're specifically looking to raise the game's difficulty. That's one of the things I'm looking at in my hack, as well as one of the things I like about Brave New World -- by having more firmly defined character skillsets (changing up the ability/magic system in FF6Tensei, for example, or the way that BNW limits access to espers), more strategy is required in putting teams together, because no one character can fill every role (which is, as far as I'm concerned, the biggest flaw in FF6). It's not that the enemies themselves are necessarily more difficult, but you need to relearn how to handle them -- the strategies you used in vanilla FF3 won't necessarily work.

That said, I'm all for new equipment -- you should see the item/equipment list I'm working on for Tensei -- and regardless how you handle game balance in general, I think there are certainly some enemies who deserve better (and yes, more difficult) battle scripts. I just don't think you should feel you need to change everything just to differentiate it from the original game; we're playing your hack because we like the original game, after all, so some elements should stay the same! ;)