We have 8 great storylines available on this game. To go through them all we need to go through the leveling process 4 times each on the republic and on the empire. side. That means you get to replay the same planetary quests content 3 times each.. That is pretty boring and double xp weekends help a bit to avoid that, but my suggestion to solve the problem is this Create 2 cartel market items (one republic /one empire version) that are only usable by a level 55 of said faciton.. Once used , you get a legacy bound item usable only by a level 10 character of the same faction that increases XP gain from quest classes by an amount enough to allow you to go through the levels 10-50 only by doing class quests . ( calculated by dividing the total quest necessary for getting from 10 to 50 by the estimate of xp gained only by doing class quests from 10-50) That would allow you to go through class storylines without having to redo planetary storylines. TL;DR please create a cartel item that allows players to experience all the class storylines without having to redo planetary questlines.