If the hittable parts of your ship are outside of the bubble arena, then the bullets, missiles, and seekers die on impact with the bubble wall. So, what I did was put all seekers on my ship, minimized them as much as I could, put them all on the same point as far out as they go on class 3, and now I stick to the edges and just move my mouse to avoid enemy fire, and launch seekers in return. I've lost, I think 6 HP at the highest with this method.
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 "Bubble Tanks 3"){kind=icon}
 "Bubble Tanks Arenas"){kind=icon}
 "Arcane"){kind=icon}