I don't get it...
I only do quests (my class quests, the planet quests, the side quests and the bonus series where possible) and thats all. Yet I NEVER arrived at a planet underleveled, not even Hoth (I never do space, never grind, not a flashpoint in months, no PVP and definitely not Heroics since I was mostly alone on the planets until my transfer last week)
I havent had a problem since launch and im on my 4th character/playthrough now.
Every planet I go to im usually 2 to 3 levels above the minimum stated on the planetary map.
How on earth do people get to their planets underleveled is beyond me, and I'd almost think you were doing it wrong.
But anyway, best of luck, you should be able to make up lost levels by doing any of the things I never do )
ps: Quesh is terribly short, it is, and pretty easy, yes.