normal missions “complete” result means double fatigue. That’s 20% or 30%. It’s strange “reduced” fail acts like it’s only 50%. I would still expect double if that reduced.
10-11%… that’s probably rounding error. The reduction will be 30 or 33%.
The cutoff for incapacitation will be most likely exactly 50.0%. But you will see 50% for 49.5-50.5
There are some rounding inconsistency after mission end and it’s not “a tick”. It happens that after mission end the fatigue is like 27%. And switching gear right after makes it 28%.