If you're going the pure Str route, Fire force is your best bet for dealing the most damage.
But take heed: swords are Int weapons. Blades are Str weapons.
You seem to be mixing it all up a bit there, which is great, there's nothing wrong with that.

It just means you're experimenting, getting a feel for it all. For the more 'serious' or hardcore gamer, however, I always suggest sticking with one or the other: Sword+Int or Blade+Str.
It's always nice to see new faces here. Look around, read some of the guides, and above all, just experiment and have fun with it.

You will find what suits you best, and with the help of the good people here, you can shape your character into something powerful.