The persimmon jam makes my tongue dry
It sounds like the persimmons (or one of the persimmons) were not quite ripe enough.


  When you eat an unripe astringent persimmon (American or Asian) the
  mouth immediately draws up.  Sometimes you'll get a hint of sweetness
  (if it is near-ripe) but the mouth-feel is immediate.  Tannins in
  persimmons make your tongue, cheeks, and gums feel as though you're
  chewing on a cross between aspirin, alum, and chalk.  Your tongue
  almost feels like a fine sandpaper. Judging the Ripeness of Persimmons


Unfortunately, I think that specific batch of jam can't be salvaged -- I don't know any way to "ripen" a persimmon if it's already been cooked into something. Next time you try this, taste a small bit of each fruit first to see if they're ripe enough.