The EC modulators are computationally demanding and require a powerful processor to handle DSD 256 rates. What sort of processor are you using for HQ Player ?
You could try ASDM5EC or dropping down to DSD 128.
Since poly-sinc-ext2 + ASDM7EC to DSD256 works on my i5-7600T (under Linux), I think it should also work on i5-10500T even better. Unless overhead of Windows plus other stuff is enough to make it not work. Even in such case it could be that ASDM5EC would work.