Earlier versions of Civilization had larger bonuses given to peaceful victories than Civ V. But I don't know if Civ V carried that forward or not.
Honestly, in both Vanilla and G&K, going a Tall peaceful science victory, your score had no resemblance on how you were proceeding towards your goal so I got in the habit of totally ignoring it. (You would normally be dead last with a tall 4 city empire in score in late game while being #1 in science & military strength.)