Not sure why, but Scy Fleets seem to do
really really badly in auto-resolve.
For example this fleet:
Is facing off against Blackrock's 4 Antaeus cruisers, 4 destroyers and some frigates. You would think that with 12 capitals, they would win handily. But they get annihilated in auto-resolve, with BR not even losing a single ship.
If I actually join the battle, obviously that does not happen.