Me the way to fix going around starbases is to make it so that hostile forces are not able to jump towards Friendly planets if you have a starbase present. But that they can jump to any uncontroled or that they or they allies ownd.
So Blue owner of planet E can jump to A.
He can retreat back to E if he wants.
But he can no go from A to B and C.
HE can jump to D and then to B.
From be he can also jump back to A, but cannot jump back to B after.
So in the end C is the only planet that Blue cannot jump to without killing reds Starbase at A
Now if the game codding will allow this i do not know. But it would be the best way to do it.
Oh and scouts with jump interference immune research should ignore this and be able to jump everywere anytime.
Ofve course this alone is not enought but it will do what its meant to do, prevent enemi from going into your back worlds, while not getting insane range from shooting one side of the well to the other.
Currently the strongest base is clearly the vasary not only becaus eit can move but because it is able to engage more then one target at a time and thus use 100% of it's weapons, were as TEC and advent can only target one enemi ship even thout they have free guns. Plus teh Vasary base phase missile massively ignore mitigation.