From Save Wizard, "The thing is depending on which is highest the game auto corrects. So if you change level to 50 but exp is enough to get to 99 you will level up to 99 as soon as you gain more exp but if you change level to 50 and reset xp to 0 when you gain exp it will go up to how much you should have at level 50."Just rising the exp will auto adjust the level?
Hope that helps