I would increase the ease of getting additional classes to 60 so you have more class types to get gear for. I would then balance out the tome gear with the dungeon gear and make 3 or 4 sets that are similar so you can equip multiple classes. I would make it so they can be improved to just barely below top end raid gear. Now you can farm dungeons for gear, save for tome gear and maybe increase drops from random monsters and notorious monsters for another set. All of which can be upgraded from crafters and other drop items.
