After quite a bit of trouble, I've defeated the fourth stratum boss. I got pretty mad at this thing, because each time I challenged it I fought the four FOEs up north first, wasting a lot of time and exp whenever the boss killed me. I'm pretty sure I could have won how I started plus some volt resisting equipment, but I ended grinding a little to get my Protector's Volt Wall to level 5 because I wanted to get it over with.
However, once I mapped out the floor I realized I could probably kill some FOEs, save, then sneak up on the boss. The FOEs respawned whenever the boss noticed me, I wonder if it would still happen if I ambushed it. If not, then there were some corners I could have probably used so FOEs couldn't join when fighting the boss.
The fifth stratum is pretty cool, probably would have been a cool surprise if I played EOI first and had I not already known what it was going to be. It's funny, I know this series isn't about the story, but EOI takes a really long time to get started, Atlus has improved that as the games went on.
I'm gonna do another run through IV and I know what party goal I want to go for, I/B F/B I/B in the front and a M/A in the back (unsure on the last character, Sniper sounds like a good idea for Eagle Eye to stack with the M/A's Star Drop and Atrophic Eye, not sure). The thing is, I can't decide what I want to use before that. So I figured I would ask you guys to tell me a party to use, something fun with good synergy, until I get the Imperial class. I'll go with the one I like best.
So you need two temp classes. Well a Landsknecht and a Dancer will work. You'll have something similar to my team(assuming you take that Sniper), unfortunately that team starts to shine in the mid to late game where you can really take advantage of the L's links.
I didn't experiment with EOIV's classes too much, so that's the best I can offer. You could do something silly like three Fortresses instead.