i saw some shots i have on the beach and many shots are really grainy, specially the blue sky. i was using nd filter so i suspect this might be the problem.
is nd adding grain?
how to do the shot if it is too shiny?
If they are on, turn off these: cine_like matrix, gain, cinegamma_d. Then you must turn on the detail coring but not your detail because it should be not above 0.
If this does not "work", turn the white balance to 3200ºK and you should use a filter when shooting outdoors. This should be the 85B filter.