I have a flash question. I have had a Nikon sb700 flash ,and just got a yongnuo 685 to add to it. I don’t have any issues getting them to fire together but I can’t get the power to match one another. The sb700 seems much brighter. I shoot with a Nikon d810 and my trigger is a yn 622. If anyone has specific ideas on exact setting I should use I would appreciate it.