The bind solver is 100% dependent on time step. It's the nature of how mass-spring PB cloth solvers work.
Your only option, is to enable "constrained" mode for your bindings. This introduces an algorithm that attempts to make stiffness somewhat independent of timestep, for stiffness values < 1. it's mostly ideal for really stretchy cloth.
Your only option, is to enable "constrained" mode for your bindings. This introduces an algorithm that attempts to make stiffness somewhat independent of timestep, for stiffness values < 1. it's mostly ideal for really stretchy cloth.