I just recently changed my lvl8 account layout and it has been working good on both PVP and Heroic Defense. Problem with lvl8 however is that you can get attacked by level 10 players and they usually wipe out your base even if you have the best defense.
For armory on defense i use Walls, Rocket Heat Sink, Burst Heat Sink, Sniper GR, Rodian skin. In my squad centre I always ask for Snipers.
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Main account: Bacon (level 11)
Second account: nEggs (level 10)
Squad - NewSithEmpire
LINE ID: sgu97cab