Matching indoor lights and flash in terms or colour might take a little gelling if you want auto white balance to do a better job - on any camera. Interested in the V6-ii so I can get HSS working on the AD600, good to see it working well & be interested to hear how you find it with Fuji too.
I have been reading on this for last two days. No definite answer from anyone. Elv thinks it should work if I put R2 Tx on top of Cactus V6II and then try to trigger my XPLOR600.
Regarding WB, I am with Alan, I get better WB with Canon but I always use fixed deg K. WB was my main reason of switching from Fuji jpegs to RAW. I couldn't get consistent WB in jpegs and it was harder for me to fix in post. With RAW it is easier. Maybe I need to learn how to fix WB in post tricks.
BTW - You should try the extension head with that AD600. I am loving it, may even order the 1200ws head one of these days.