Take a look at http://ark.gamepedia.com/Breeding#Times_for_Breeding
You will see that every dino has different times for hatching and maturation. Those times are affected by the multipliers, so it is not possible to have every dino grow up in 30 mins, because the base time is different.
For the options:
MatingIntervalMultiplier - affects how soon you can mate dinos again after mating. Base mating interval is 18:00-48:00 (random), apply the MatingIntervalMultiplier to get the new interval. E.g. a setting of MatingIntervalMultiplier=0.1 will result in a 1h48min - 4h48min intervall