Im surprised you didnt go with Endor Gambit, the extra refresh can come in handy a lot and AT-STs are quite good. Other than that looks pretty similar to what I started out with.
Something I've been struggling with though is that its frequently slower than you might expect and struggles to defend adequately. I am changing my build to accomodate, but it feels really clunky to me, and its real bad if your opponent neutralizes your early star destroyer(s) since you dont have much else to help you out.
My current build is:
2xDeploy the Fleet
2xDeath and Despayre
2xThe Emperor's Web (this was formerly either Ultimate power or Vaders command.)
I didnt like Ultimate Power because the units in it (aside from Tarkin) are pretty lack luster. Vader's Command, while slightly better, felt mostly like it was just chaff, and I didnt really need Vader. Hence, currently testing the Emp instead, since he gives you some nice board control, a resource and two strong defensive units.
2013 Star Wars: The Card Game Worlds Top 16
5xX-wing, 4xB-Wing, 2xYT-1300, 4xY-Wing, 4xA-Wing, 2xHWK-290
8xTIE/LN, 5xTIE/IN, 2xTIE/Adv, 4xTIE/B, 3xFirespray-31, 3xLambda