Some custom stations are nearly impossible to dock with if you have a slow ship like the Armored Transport. I line up the ship with the bay almost perfectly but at 40-50m from the bay the ship flies up above the station. After that it just bounces around the station with no chance of docking. Is there any trick to dock it?
P.S. I let the ship for about 10min hoping it will find it's way. It did not .