How can the C2 survive a defensive engagement with only 2xM coolers to cool 2xL shield generators when similar ships (Starfarer/Gemini, Genesis, Caterpillar, Carrack) ALL have 2xL coolers to only cool 1xL shield generator?

While it's better for anyone flying a C2 to have an escort nearby, this configuration should still last long enough to get away or call for help. The other ships mentioned all have to use their power in ways that the Starlifter doesn't, be it to run life support, computers, or other modules).