Look, I will add my two cents as I have gone through locks a couple of years ago. My headline would be: take it to the good locksmith.
If I could find a guy here in Poland who re-did my tumblers around the car to the key code from the data card (except fuel filler, which I ordered from Mercedes also by the key code) - you would definitely find one in the US. I am sure there are names on this forum. Bring the handle to them.
I would also be very careful with using lubricants in the locks. Usually you have improvement for a couple of weeks - then they pick up dust and get stuck. Unless you use some specific dry lubricant. The old method in my country for car locks, particularly ignition lock, is to take a soft thick pencil and rub it really well against the key cuts from tip to shoulder.
Last thought I would share refers to ignition locks - if it jams just once for a moment, it
will jam for good rather sooner than later. Do not wait. Do not ask me how I learned it.