Is 405 impressive? No, not really
Is it a good lift, and accomplishment? Yes, getting a big pr especially when adding another plate is a great accomplishment for anyone. So good job on the lift.
Whats really important is how was your form during the lift? Also did you use straps? Those two things if you used straps and hitched a lot could add 100lbs or so to your deadlift.
So make sure you have solid form and avoid the straps for the most part-since your posting in strength form, you want big forearms and strong grip-
As for the height issue, lifting in general is harder for a taller athlete just like adding mass. Its not a huge difference for the most part and you should not put much thought into it.