How mean must you be to be creating armor and throw up this result. This is probably what it sounded like during creation of the armor (not exact, similar):
"oh ok. vog will be swords. It has elemental, so to make it more useful we should add fire resistance, used for FSC. Volcanic demo is also elemental, like vog, i think we should add fire resistance so bombers have a nice FSC set as well. So that's it? Oh wait yeah theres those gunners... ummm... do they even have an elemental defense set? What! I do not believe you. I don't remember doing that, just giving them a damage bonus set like skolver, only less damage and negative status because guns sound like they'd be too powerful. What's that? oh yeah, I guess you are right. We did make them deal less damage in the first place. Either way, we've already wasted enough time. Not like anyone will really care if this nameless set has zero fire resistance."
No, you are all so evil T_T. Give me fire resistance. Don't forget that you mentioned fixing an under-powered gun line a month / however many months ago... I don't want to remind you guys what the set of guns are called since you should remember but I will give you a hint, they come from the jelly king T_T *sniff sniff*.
I would say that shadow/fire resist is better in fsc. Unfortunately, there is a lack of shadow/fire resist gear outside of the shadow lairs.