BaggerMAN - 2018-05-25

Have you tried to specify a specific version of PFR (SHA-512, etc) before mount?

And, as far as I know, using the PIM parameter, you can adjust the number of iterations used to verify the password / keyfile. The smaller the value, the faster the check (and less secure).
https://www.veracrypt.fr/en/Personal%20Iterations%20Multiplier%20(PIM).html