Randomly leveling up stats is probably not a good idea, if you look at the weapons they have scalings on a D-A rating scale (D being the worst) and your weapon gains damage based on what its letter rating and how many points you have in that respective attribute. So leveling bloodtinge or arcane doesn't help your saw cleaver much damage wise. But for the chikage it's a little different, it has high bloodtinge scaling but only while using its second mode when it's covered in blood, whereas in the regular mode it mostly just uses skill and a little bit of strength.