Open the default mission in notepad, copy the skill for the Ju88's.
This bit:
[BoB_LW_KG3_III.33]
Flight0 1 2 3
Flight1 11 12 13
Class Aircraft.Do-17Z-2
Formation VIC3
CallSign 25
Fuel 62
Weapons 1 1 1 1 1 1 4 1
SpawnFromScript 1
Skill 0.58 0.21 0.32 0.053 0.32 0.42 0.58 0.63