I'm apparently really lucky. The balloon's never bugged out on me and I've done it probably a dozen times now between beta and live. If you want to skip the annoyance of that though, get a guardian or a commando to force push/concussion charge you up onto the sandcrawler.
Nar Shaddaa is the low point for datacron jumping. You don't have to deal with anything quite as bad for the rest of the game, at least not that I remember (not counting the +10 which I still haven't done). There are a few that involve purchasing items similar to the key on Balmorra.
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