3D-printed hovercraft top speed

I have a GPS from my FPV drones that I put on the hovercraft just to see how fast it is. But the problem I have right now is that it is not stable enough to drive over 50km/h.
I've been driving my hovercraft a lot over the past 2 months, I haven't been able to record everything but here are some clips that I want to share.
I'm still trying to work out all the weird kinks with the hovercraft before I release the STL-files. I'm currently putting together the second version of this hovercraft, and in the new one I've changed quite a lot of things to make it better.
The printfiles are now avalible on Printables
https://www.printables.com/model/8120...