As a follow up to that, as it turns out I did recover in time to not only defeat the 10x Contingency but actually stomp it. By the time the Contingency spawned, I'd managed to assemble 12 fleets of 28 battleships, each with about 650k fleet power. The fleets weren't optimal since I wasn't using penetration weapons, and consisted of 12 energy weapon loadout ships, 12 with kinetics and 4 with strike craft. Strike craft are still buggy in a few ways, but I keep a few in my fleets for flavor. I was lucky to get dark matter tech right before 2450, which bumped the fleets from 500k to 650k due to the shields.
Each Contingency fleet was about 850k in power, with the sterilization hubs having fleets of about 2 million power. When engaging them I tried to fight individual fleets with 4 of my own, which typically led to only a few losses on my side that I was able to easily replace. The sterilization hub fleets maybe destroyed 10-15 of my ships in those battles.
Leaving the logistic growth curve in place while removing the pop growth scaling penalty leads to absurd power creep, to the point it was so far outside of the norm I consider this game to have been more of a power trip than legitimate. Without conquering anyone, I had about 5,000 pops when the crisis spawned and about 45k monthly research output from 3 ring worlds and a dozen or so tech worlds, which gave me about 50 levels of shields, energy and kinetic weapon repeatables, with a scattering of others like 15 levels of strike craft and resource boosting repeatables. It was truly something to see 400 pops almost instantly migrate to these ring worlds as the segments were completed, as I was never able to keep up with unemployment. Even 30 habitats, needed for the rare resource production and naval capacity, filled up instantly and started contributing to the pop explosion.
Funnily enough, despite all of that I don't think I would have been confident against a 25x Contingency. If I were truly going as hard as possible to increase tech and fleet power I could have probably built 1 more ring world and a few dozen more habitats for naval capacity and rare resource production, but I was running into a hard mineral limit that would have made this either dependent on the mineral extraction repeatable or buying minerals off of the market. Really, I guess more naval capacity for more ships would have mattered more than tech at that point.