While most materials will struggle to reach 10 hearts of damage (there's an achievement for it), titanium weapons are able to greatly push over that limit to the point where even pickaxes can one-shot mobs:

This makes titanium far superior to any other tool or alloy and allows beating otherwise difficult enemies and bosses far too easily.
So I'd like to suggest reigning in its power a bit with one or multiple of the following changes:

• Change the armor bonus to additive defence instead of further boosting damage
• Add a speed penalty to weapons boosted by the trait
• Reduce the amount of power given for having multiple titanium parts
• Make weight ratio apply a different effect than raw damage boosting - for example, it could deal more damage to "heavier" (larger) mobs

I hope some adjustments can be considered to help keep other materials worth using, thank you.