just one battles per turn

[klausD]

The tactic against this "defense" is easy. I just send out a small attack force in every of the sectors where the 1 ship defense fleets are lurking.
In this case small escort ships in the attacking fleets have an additional function. (building a vanguard which clears the path to the main attack objective)

The tradition of having just one attack per stack is very proofed in many games. I think such a rule will function very good in SE too.