So far, I haven't needed to actively grind for levels because something is kicking my tail too hard. There are some tough points early on (Imperial Camp in Sabin's Scenario...2x Templar + Soldier fight is nasty as hell), but strategy tends to play a larger role in your success due to the time some battles can last. Battles are longer, yes. Neither can you spam the attack option for instant win most of the time.
Example...TunnelArmr at the end of Locke's Scenario. Using normal weaponry for Locke, you'd be lucky to do 10+ damage every hit at lv8 (That's the level my Locke & Celes were at for this fight).
However, if you have the Aquarius Spear from Sabin's Scenario (Located at Serpent Trench, 2nd cave section), Locke's damage suddenly goes up to a much more healthy 30+ damage a hit. Beating this boss at lv8 now becomes viable with a bit of good fortune on your side. The 10k xp each character gets from this fight will probably shoot them up from lv8 to lv12-13.
TL;DR - Strategy & planning > extreme grinds for levels in most cases.
Other random things that have changed/advice...
- New curves for everything. HP growth, MP growth, XP requirements, and so on.
- Changed skills. Sabin's Pummel for example now can inflict the Countdown status on enemies. Incredibly useful early on for enemies with high defenses.
- Enemies that can basically murder front row characters with alarming speed. Back row for everyone is highly recommended unless you are very confident in your abilities with said character (You do enough damage in the back row anyways).
- Gau's rages have been changed. Ghost for example will have him casting either Ice or a new ability, Enervate. That will heal the MP of whomever it targets. Very very very useful when he's paired with Celes or Terra early on considering Tinctures are expensive & gold is EXTREMELY tight in the WoB (Zozo is basically the only place to get a decent amount of funds...or so I hear at least).
- Related to the above point...find those Elixirs, sell them. They're worth 3750 gold each and can fund your equip and Tonic buying binges until you reach Zozo.
But yeah, I love this hack for the challenge so far. I'm only hoping it'll keep up when I hit the WoR. For whatever reason, I find most FF6 hacks seem to drop any sense of normal enemy difficulty when I reach that area and it kinda irks me. JCE3000GT's hardtype hack for FF6 is a prime example. WAY WAY too easy to break that hardtype hack into something EASIER than the vanilla game (230+ defenses for a team of 4 and max MBlock for 3/4ths of said team with the other character having 110 MBlock? Yeah).