I had the opposite problem, I dinged 60 right at the beginning of Revendreth and ended up having to do quests for another 1.5 hours. There's a lot of variability unfortunately. I had warmode on and collected herbs/ore. I did a lot of side stuff in Bastion too until I realized what I was doing. Point is, there's no way to "balance" this exactly because people are going to play differently.