XP was revamped so that you should actually be ahead of the content for most of your drive toward VA50. But make use of the DOff system. In one turn-in session alone I went up two ranks on my Klingon.
If anyone is stuck on getting exp and there are no really good missions to do, or if you have tips on getting quick exp, post here!
And theirs a great deal of experience to be gained by working the DOFF system, (which continues to garner points while you're off-line) Fleet actions, such as Starbase 24 is also a good source for low level characters...
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A good list to follow is on STOWiki