There have been some changes to these since we first started offering them, one of which we special order. The Spitfires are now stiffer, center better and have different switches than are normally standard with this type of stick. We also make sure they are well lubed due to the heavier spring.
There is still a tiny bit of play at the centered position, but nothing like the earlier version. They are a nice option these days, especially where space is limited.
Compared to something like an X-Arcade, which is very stiff, it's not surprising that a major difference is seen. They are a different kind of stick, with a very different centering action, as are all Japanese-style sticks.