I'm about to face the final boss of the Inaba Pride dungeon and this labyrinth was so challenging and frustrating to navigate thanks to the pathing of the FOEs. I know there's another labyrinth after this one but since I'm near the end of the game, I though I'd ask about this.

I've gotten 100% on the previous labyrinths to get the chest rewards but I really don't think I'm up for going 100% on these floors because I don't know if my brain can take much more of this Inaba labyrinth. Will something special happen if I go 100% on all the quests and/or floors? I've done every quest in the game so far I'm pretty sure. Examined all the nooks and crannies of the floors that activate quests, etc. Should I bother with getting 100% on the map? Will something worthwhile happen if I do?

There's nothing special. You get some nice items from quests and chests but there's no secret ending or anything.

I usually got 90% on a floor and just used play coins to open the chests.

The 100% chest on the final floor of the final dungeon is Light Wave--a severe bash attack skill card, which I was able to do insane damage with on the final boss with Chie 1,300-1,700 at level 60ish.

Inaba Pride Exhibit was a really annoying dungeon. The next one isn't so bad.

The story is about to get really heavy though. Enjoy it.