There are so many parts in the Hope stack, I am hardly surprised that you keep getting play developing amongst all the interfaces. I had similar issues, and was less than impressed with the design overall. It wasn't too dissimilar to an XL Orbit 11, just with more seals and rings in the stack. Mine had water penetration after just a few rides. I managed to swap it for an old King, no issues since.
PS: the Hope headset was a warranty replacement for one of the Mk1 Hope headsets, which lasted a few years until the bearing went, and I found out these were not available, and not retro fittable – according to Hope.
Overall, quite poor really and dissapointingly no where near a rival to a King!