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your stone is darker most hindostans look like they have been coffee stained or orange in color

thats a good set up i would use your 325 lightly then go to a knife to see if the grit issue go's a way ,if so finish the stone off with your 2000 grit sandpaper.

heres my hindostan not the best pic tho

i have two hindostans stones they shouldnt feel like they have grit stuck in them they should fell like a translucent but with a lite "grab" this is the feel of running a razor over a hindo

what type of flatting stones do you have or sand paper ?

thats a very nice hindostan stone