Originally posted by BruceBanner but in reality when working with the subjects you can risk things like tops of their heads being drastically differently exposed.
Yes, but just to be clear, that's the nature of HyperSync/PowerSnc/...Sync in general.
If one has the funds, it's way easier to add flashes and use HSS, instead of messing about with HyperSync.
Originally posted by BruceBanner I also learned that the K-1 cannot do rear-curtain sync natively, ...
This has always been a flash-feature in the Pentax system. In other words, the K-1 "operates as designed'.
EDIT: However, if the Godox triggers actually support rear-curtain sync on Pentax cameras that support the respective configuration (see below), it could be that the K-1 is unnecessarily handicapped indeed...
What makes you think the KP is different? Perhaps you are right, I just never heard of the KP doing anything differently in that regard.
Note that just because the KP -- as other cameras -- offer a rear-curtain sync option, doesn't mean that an attached flash will operate in rear-curtain sync mode. The flash has to support the feature natively, unfortunately.
Originally posted by BruceBanner So having said that, does the Xpro-P or X2T support Rear Curtain Sync as a mode/option on the trigger?
I don't think so, but I could be wrong.
At least, there is no configuration option for rear-curtain sync on the triggers. Both are advertised as being able to support rear-curtain sync, but no option becomes available on the K-1, when the trigger is mounted, so I wouldn't know how to activate rear-curtain sync. Maybe it would work on a camera that always gives one the rear-curtain sync option, no matter whether the flash offers to support it? Let me know if you want me to try it.
Originally posted by BruceBanner If not I guess it's delay then as you mention?
On the Godox triggers, the delay range is not big enough to implement a poor man's rear-curtain sync.
The Godox delay is just meant for adjusting the HyperSync sychnronisation.
Originally posted by BruceBanner I'm now wondering if the XT2 can help get around some triggering hurdles with the V6ii on top to get the RF60x's to fire...
Which hurdles are you referring to?
Note that the X2T-P only has a single pin hot-shoe. A mounted Cactus V6II would not be able to operate in HSS mode.
I haven't done any tests yet regarding the timing of the X2T-P hot-shoe triggering. It could support work around techniques, if you want to use your RF60x's in manual HSS mode.