Try turning the squeegee pressure regulator down to zero on the heads you are not using.
I don't do that because then they still actuate and the floodbars go very hard if the squeegee is set to 0 psi.
heads not in use are usually set down to 20-25psi for starting point of test printing.
Anyway that stuff wasn't really an issue because there isn't a squeegee in there to mess with you during the run.
Looks like the Diamondback S solved all of the issues I can think of with the one we have. Now just to get A/C heads on such a low priced machine haha.
Does the Diamondback S go faster than the older R since it's a server index?