I don't use damage scrolls in combat, so I'm a bit unaware of the problem. Is it that you can use a scroll above your spell casting level? At least you cannot learn from a scroll which is above your spell level. That's enough for me.
For the rest I'm not sure wether Sorcerer or Wizard is better. Maybe still Sorcerer. Nevertheless I prefer Wizards, Evocation and Abjuration are just great in high difficulty settings.
