Dear Alex,
I have some concerns related to the use of ISMEAR. When I look at the example of Si, you used Gaussian smearing ISMEAR=0. Although VASP is recommending not to use this type of smearing for semiconductors, and rather recommends the tetrahedron method ISMEAR=-5.
Is there a specific reason why to use this type of smearing for the AMSET calculations? Do you expect large differences to appear?
Kind regards,
Simon