I have three Yongnuo YN560 3 speedlite flashes and one Yongnuo YN600EX-RT 2 speedlite flash. I usually use Hahnel remote slave transceivers but cannot now due to incompatabilty with other kit. I have heard that I can possibly sync these Yongnuo flashes using the 600-RT 2 as a transmitter. I use all my flashes for water drop photography so they must be accurately synced together. Any help?