You might want to look at "Heroes of the Aturi Cluster" campaign. It's a rebel co-op campaign, but handles a lot of what you are trying to do as far as campaign advancement and has had some playtesting already performed.
Overall, I think you have some good ideas - though I'm a bit concerned about the XP per hit/dodge. If that's "per die", that just makes having high attack/defense dice a bit too good. It would be better if it was 1 XP per attack, regardless of the number of dice thrown.
Also, on the per kill, you might want to make it 1 XP / 10 points value of the ship destroyed, rounded down. Thus, killing a Tie would be worth 1 XP, shooting down a X-Wing about 2, and so forth; the more difficult to take out the ship, the more valauable the reward.
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