Gladiaxa
I'm just going to point out here that good RP means that sometimes you know when to concede the fight and admit that you're beaten.
I'm not going to drag this entire storyline down into one prolonged "whose fleet is better" argument, so for now, we'll just say that the High imperium fleet, along with much of the scrap from the battle, has retreated and is preparing to jump to FTL. But it's people like you who make bad RP. We had a story going, and you just hopped in and screwed things up.
As for the HW, I'm am gonna call BS on that. It got slagged, there's really no coming back from that. I don't care what kind of fancy tech you have, it's much easier to just go find a NEW homeworld.