High density ratios kupershtokh

Dear people,
I want to implement high density ratios with kupershtokh multiphase model. I am simulating a droplet in the middle of the domain and slightly decreasing the kupershtokh temperature to get the “stable” densities.

However when i use that densities in my other simulation “the important one”, the system blows up. Do you have experience on this.

JL