Aye! Needs more escorts.

1 Wraithship for four Hunters would already be good enough.
Yes, you need to be decisive against the Explorers. If you had crippled two the Eldar would get more fun.

The Void Dragon should have been more into it. It has devastating weaponry. And the sun-effect movement needs pre-planning. And, yes, the more you play it gets better. As you wrote a 50cm movement + 30cm weaponry means a 80cm striking range.
Perhaps the inititial lock-on run should've been a tactical placement move.
But learning is fun!