Yeah, I figured you wanted them to scale up to you, and I said it was already included.
Apparently though, you want them scaled down.
Personally (and I know it's a popular suggestion for Pillars of Eternity/Project Eternity) I prefer if all 4 party members have a slightly seperate XP value. That way instead of having 1 long wait before leveling and then having to spend a lot of stuff it's a more gradual progression; with less time between levels, and each level doesn't take you as long to spend stuff, and allow for a more gradual increase in power of your party rather than the massive boosts a level has currently, since all 4 suddenly increase in power.
With as big a difference that levels make in this game, I find staggered level ranges in the party makes for more awkward combat. A level 6 character in your party may be holding their own against level 6 opponents, where as the level 5 character in the party is struggling against them. Or, your opponents are level 5 and the level 6 character in your group is mopping the floor with them and making the entire fight trivial. That issue makes me prefer parties who are all on the same footing.
That said, it could always be a prompted option when you have the follower join your party for the first time (
"Would you like to sync your follower to your level?").
