.... the D810 will give a faster synch speed (1/800) vs the 1/250 speed of the D750.
Are you sure that do you obtains Synch speed of 1/800?
Nikon's specs indicates:
Flash sync speed X=1/250 s; synchronizes with shutter at 1/320 s or slower (flash range drops at speeds between 1/250 and 1/320 s)
Nikon's specs here: http://imaging.nikon...r/d810/spec.htm
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