The ribs look mighty fine to me. Like the old saying goes if it ain't broke don't fix it. What matters is if you like the results. Everyone likes their ribs done differently.
Next time give them another 30 minutes and see if you like them better. If the fat renders more to your liking. Then try another 30 until you find the sweet time for the ribs the way YOU like them.
That way your ribs turn out exactly how you want them everytime.