Casualties are chosen first, and then resolved.
➢ The loser of the round first chooses all their dudes that will become casualties and what will happen to them. After nominating all their casualties, each casualty is resolved one at a time. Reactions to the loser taking casualties (Takin’ Ya With me, Hot Lead Flying) are played after the loser finishes.
➢ When the loser has resolved their casualties, the winner of the round then chooses theirs
and resolves them in the same way.
You have allocated adequate casualties, satisfying the requirement to 'fairly' take all of your losses.