Sword saint is not interesting with the elven curve blade.
It required dexterity to damage.
After rogue or thug...
I know sword saint, i have played saint vivicector, dex scion from ineffect and the version with bastard, its a very good classe.
But with the elven curve blade i have here 6d6 sneak damage all the time, AB if needed up to 51, opportunist, cleaving finish so....
Well obviously you need to invest in SS to reap the most rewards, it's not a class you dip 4 levels in.
In this case you'd be better off going full glass cannon and simply taking Slayer all the way. But I don't know why you want INT at all in this case.
Your build is all over the place and needs to be refocused.
He goes INT because he’s an Elf. I’ve posted it before but I like Divine Guardian 1/Thug 3/Vivi 6/Thug1/DG2/Vivix for ECB Elf.
DG for Martial Prof, CHA to saves (you’ll get at least 4 free CHA by the time you really need it), a Smite and Bodyguard to go with all your DEX, and Fatigue Mercy.
Vivi because DEX melee needs all the modes on mutagen since you can’t boost DEX with size, and INT is its caster stat. You also need the extra damage from full sneaks and Feral Mutagen since you’re not STR-based.
Thug to get all the great stuff from Unchained Rogue 4 + Brutal Beating. You’re not a Perception class. Unlock Advanced Rogue Talents first for Double Debilitation. Alternatively can trade Thug for Scoundrel for Image and some of those True Strikes you like.
Magi should stay in their lane and not use two-handers.