Hi there

I've just bought my first second-hand santoor. I'm able to tune the bass notes easy enough, however I cannot get the higher octave part of the string to be anywhere close to the same note the bass side is tuned to. I feel like it's the position of my bridge. I've been trying to shorten/lengthen my octave higher side and find a balance between the both sides and the length they need to produce my required not but it seems impossible at the moment