I'm fairly new to WW, but my understanding of set points is that they're for use in situations where you really can't measure: parties, restaurants, etc., rather than when you want to eat more. I'd say when I want to eat more is when I need to measure most!
You're supposed to eat a reasonable portion of the food, eat mindfully, and stop eating when you feel full. The set points are higher than the points for a measured serving of the item. The idea is compromise - for the flexibility of being able to eat away from home and enjoy social events, you pay a slightly higher points value.
Long term goal:
Short term goal: