I don't know, after you get Edgar, the game was not much harder than the original. After Locke gets Eagle Eye and a long-range weapon, he is as efficient as he was in FFVI, but without the Eagle Eye (Sniper Sight).
You can't exactly focus on stats, whatever they are, when you don't even have Espers; the bonus you get from equipment does not improve the hit rate much, and you can only sacrifice so much defence (Ribbon is unusable, btw).
I have just finished the demo, my strongest char was Lv17 and I never found the game difficult at any point -- I mean too difficult, the difficulty is rather well balanced without power leveling once.
When I get unlazy, I'll host pics and report the bugs, typos and mistakes I have seen ;s