Uhm, high speed sync is for cameras with focal plane shutters. Leaf shutters and strobes with short flash duration is vastly superior to HSS which uses an enormous amount of power to pulsate x times when a focal plane shutter curtain starts moving...
I agree that leaf shutters with short flash duration is usually superior ... which is why I use a Leica S(006), and all my lenses except one are Leaf Shutter CS versions.
However, Hasselblad chose to use Nikon flash protocols with the X1D which one would assume includes the option to use a Nikon speed-light with HSS. Profoto (and other strobes) make
dedicated remote TTL/HSS triggers for Nikon, Canon, Sony, and now others.
That would argue that HSS also works with the X1D leaf-shutter lenses. Why wouldn't it? Also, to use the X1D's 1/2000 leaf-shutter, the strobe has to be set so the t.01 duration is 1/2000 or faster. That usually means less power.
The key is understanding what the OPs desire is. I understood him to want to use the X1D's top 1/2000 shutter ... which could be to enable wider apertures, and/or to freeze action better in certain levels of ambient light.
I use a Profoto B1 and B2 with a Sony AIR TTL/HSS for the above reasons, and the pulsed light has not been a problem because it is being used outdoors to knock back the background and/or shoot with a wider aperture to separate the subject from the background.
The other option is to investigate some of the newer hyper-sync strobe solutions that sync at any speed even at full power.
- Marc