I dont know about Nissans, but on my DSM I know the advance/vatozone parts could come with different length rods on the slave cyl. Might check that compared to the OEM to make sure it is the same length.

When you adjust the clutch, you want to make the rod longer at the pedal (thread it out as if you were loosening a bolt) so that it presses the master more.

Otherwise Id say you need to bleed it better. What method are you using to bleed?