1 - Definitely dont go with the 45 tank armor. 200ee lvl 35 is plenty to last until your 55 armor, at least for now until you upgrade others.
2 - 65 strength is A LOT of extra damage, but you are probably better off just tanking. Let others break out their dps armors. When you get more fg after upgrade other stuff then start working on strength armors.
3/4 - Upgrading your swords seems like a good place to spend the FG for now. The gap between your lvl 40-55 swords is pretty big considering its only a 110EE sword. I'd recommend new MQ weapon first, or filling the 40-55 gap a little.
5 - New stat charm I'd say is 2nd priority to the swords.
TL;DR
Priority
1 - MQ sword
2 - Fill the 40-55 gap in your sword set
3 - Stat charm