Dude, don't come to the forums and complain, fix it yourself.
Just ask the group if you can kill the mobs for the XP. Mention that it gives a lot.
Hell, adverstise the idea of LFG to do flashpoint X and kill all the mobs for the XP on the appropriate level planet. You'll get people to bite and none of them will be overleveled.
If that still doesn't work, roll a tank. THAT will definitely work.