I'm on 4/26. Playing on Hard too.
It took me a little while to adjust to SP management and the Strength/weakness system, and I spent some time speaking with people to increase stats. I'm currently about 75% of the way through and things are going smoothly.
It felt too long at first, but being able to jump out and return while taking time out to do side activities balances it pretty well. The only thing that bothers me about doing this is your party insisting we return to the palace constantly.
Yea, this pretty much what I have been doing.
I was just surprised at how long this opening dungeon is compared to the first one in P4. Hopefully I can beat it on 4/24, unless the boss is super hard.