Maximilian, that is exactly what is unbalanced here. 300 million credits in 3 hours is obscene, hopefully something will be done about trade routes in the future releases to nerf those profits a bit. You have no less than 5 Capital class ships yourself and then some, and how long have you played on Discovery?
I think Battleships are quite strong enough as they are now, they're just too accessible. The only reason every newbie and their dog has a Battleship is because they can, in 3 hours should they already own a good trading ship. I still suggest trade profits should be set a little more in-balance with mission profits, perhaps increasing high level mission profits slightly and decreasing major trade route profits a bit.