Cactus V6II with Nikon SB800 and SB910 Speedlights on Fuji XT2

I'm trying to run 3 SB800's and 1 SB910 ( left over from my Nikon days) on my Fuji XT2. They all seem to function in TTL or Manual but- I can't get full power flash dump via the transmitter/receiver connection. The "Flash" button will. Is this just something I'll have to live with or am I missing something. Also, the transmitter on camera only displays channels A,B and C. D is showing a Lighting Bolt. The camera ISO, aperture and shutter speed display and change on the V6II.
"help me understand???"
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