I am all for harder content, however losing nearing +40% hull per sphere detonate is rather annoying. This is regardless of ship configuration, even when running in full tank configuration. Though I cannot confirm it perhaps these detonates are ignoring resistances.
Are you directly launching the game from the STO folder? If not give this a try. The Arc launcher was causing an issue, at least for me, when I launched STO via it by locking/crashing the game. When I created a shortcut to do the aforementioned directly form the STO folder fixed address this.
Travel to your Fleet Spire and find the acquire ship vendor, it should be there. Which is where I found it, and it never appeared on any other acquire ship vendor.
At least am not alone in this regard. The Rahhae was the only one I claimed from the pack, I got the starship trait back when it was 1st released, now nothing. It was working at some point, Arc has some explaining to do ;)