well it works great! however ive only tested this on my own version, which i created level 1 data for everyone, including tellah, and golbez.... (this means my level up data has different pointers)
but the problem i encounter is when you get the character back the required exp is jacked up and they have way too much for their next level... i do not know what causes this, but my characters level 1 data worked perfectly.... its something about their storage and getting them back that messes them up...
now to give a little more detail, i also made it so every character's exp curve is identical to rydia's since her lvl99 exp requirement is very close to the max cap.