Where you're "supposed to be" depends on the details of each individual recipe.
But those readings you've gotten were in a perfectly good range for a moderate alcohol beer with a decne mouthfeel (i.e. not watery tasting).
FG estimates are always a bit of a guess, so you should never expect them to be spot on.
Bottle conditioning: Robust Porter
Drinking: Saison Dupont clone, tripel
Coming soon: Columbus APA, Rich Red ale