I just completed this game.
I had a different set up.
I created two frames from the initial global diagram. We have two choices for our Tuesday selection, with one being W and one being F.
I thought this would be a very limiting factor. You could have also framed this from the standpoint of W being on Monday or F being on Monday.
I felt that the selection of fish would be more limiting since it would incorporate the ~WW rule with one of the selections.
I also would like to note that R and S are interchangeable. Thus, on the question asking about which one of the following, if true, would completely determine which fish are selected on which day, we MUST resolve the RS interchangeability issue. Therefore, a rule MUST address this. Only two of the rules did of the five, which really narrowed the time with that particular question.