If you check your Chain Cover, Cold tyre pressure for both Single & Double rider is mentioned.
For best performance, keep 22psi in front tyre, and 35psi in rear. (But with 35psi, you won't be able to do pillion riding. So if you want to do pillion riding increase the typre pressure upto 42/45psi)
Your weight is less so keeping less tyre pressure will help get better grip on the road. And this bike is notorious for having zero road grip.