The pins in new locks have pretty tight tolerances for the first couple years until they wear a bit. Its likely they are just using older equipment which isn't sufficiently precise to cut them. Get a key that is exactly right, and works with a bit of wiggling, use it as your primary key for a couple months and it will work just as well as the originals. The slight variations in the key ways/etc will knock the edges off the pins with enough use. Assuming the key is cut correctly from the right blank, you might just need a bit of lube/oil on the key. If you can see variations by eye in the ramps/etc its likely the key is just wrong.