Greetings,
Moving up to larger ships players have problems getting in/out through the mailslot at a station. But per this picture
link it is really huge. The problem is flying smaller craft then trying to do the same with a much larger one. It is an optical illusion which I bet some Dev who programmed this is laughing at you!
The solution is simple. Buy a Docking Computer and see how it makes a perfect approach to the mailslot. This also works when departing a station. Then you can do the same manually every time. With big ships and inertia thrusters are important with the Cutter being the worst. But I land/depart it manually all the time without any issues or scraping against a Beluga going out while I am coming in. The Docking Computer can show you how to do it correctly for any ship a player flies. Then discard it if that is your play style. Great info especially if you are a Smuggler!
Regards