[Nitram Draw]

I think the only way to find out how fighters work is to remove all bonuses from the fighter and sample target ship and start observing the hit % of different size Groups.
If fighter weapons work like standard weapons then the lowest to hit for 1 fighter with 1 DUC will be 90% at range 2 and 99% at range 1.
Then start adding fighter to the group and adding bonuses.
There is definately something different about fighters.