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problems with flip mesh when upresing sim

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I have a problem in my sim when I try to increase the resolution. 

I get close to the results I want when the simulation is about 2 million particles but when I increase it (15 M) the results get worse, the mesh looks chaotic and the particles are really sparse.

Also some particle has to much velocity. Should I try to delete the particles based on velocity and don't mesh it? Iv'e tried to change particle collision method(move outside), not reseeding particles and no detect under resolved particles but with not much success.



Low res sim:

low res sim.png

High res sim:

hi res mesh.png

Edited by pau22

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