With Skilled Foraging and Skilled Gathering:
I'm seeing that there are two options here for someone using this skill:
You get a random item from the chosen location, with a fixed rate of getting an unusual find based on how common unusual finds are at that location. 1/4 for Low or Very Low, 1/3 for Moderate or High.
You get one specific item listed for that location but have no chance of encountering an unusual find.
Is this assumption correct?
As a follow up, what does Keen Eye do to these odds?
Furthermore when you use a normal Foraging or Gathering skill, is there any chance of finding an uncommon find? Is it random and based on chance as opposed to a fixed rate, or is there just no chance?