In Puzzle 6, you should play FEY f8. Although the Y is typically a better tile than the W, in this case the W better compliments the AINRT leave because it forms more 7 letter words. While you aren’t technically fishing, in situations like this one permutation is still extremely valuable since it allows you to figure out which leave is better.
Often concepts such as fishing and setups are still important even when they are secondary or even tertiary considerations. When 2 or 3 plays outscore every other option, you should observe how each of these options help you draw good plays or setup the other tiles in your rack even though these effects are not the primary factors driving your decision.