It's a very good idea to make pylons moveable >:-}
This will completely deny each attempt to let structures being build only inside of energy grids and make energy links much more unstable because of miss-clicks :P
If defenders would need 2 energy connected, ppls wouldn't spam them so often.
They should only need the energy connected to reload, not to fire the missles.
Because they take so long to reload, and die so easy, it wont be a main issue if they have to wait for the solar to open.
Just another idea to render defenders into a more unique defense:
If they fire missle-drones with a self-d-range1-weapon, they can shot all 3 missles at once and the other 2 retarget if they lose the target. A life-time should be able to avoid unlimited hunting.
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About the Radar-Idea ( which is not the main topic!!! )
Informant would be a nice thing.
Cheaper long range radars, but more wooble for these.
Radar spots should be squares and only become dots if they move.
So you can distinguish between units and structures far better.
Artillery should primary attemt to target the squared spots.