You are seriously underestimating player-piloted Afflictor. It can kill fleets on it's own, and nothing prevents you from swapping to next one after it runs out of PPT. In terms of own DP to kill-able DP ratio Afflictor is single most powerful ship by a wide margin (in vanilla and most(?) mods).
Spoiler
https://www.youtube.com/watch?v=v1fF21o0Ntc
Spoiler
https://www.youtube.com/watch?v=YtbRz19oXOw
Hyperion is nowhere near as efficient as Afflictor and somewhat tedious to pilot, but it still surpasses a lot of recommendations here.
Spoiler
https://www.youtube.com/watch?v=BH_SRbrMKeY