No need to weigh a fish under 40lbs for club purposes, as it won't stand in top 10 at end of tourney.
If you want to weigh in a smaller fish if you think you have a shot at a weekly (especially early and late in the tourny) go for it.
Somebody just back of you while you are fishing is as bad as someone looking over your shoulder while you write a letter to your girl. ~Ernest Hemingway