Is there anything I can do to help the Opaque White keep from dripping out of the ink head? I know its common for the white to drip when you close off the valve to do a purge to the other colors but when I leave the valve open it still drips... and I mean an excessive amount. The room is 72 degrees and I don't know what the temp of the ink head is. If there is any info on this I would appreciate it greatly as the white is dripping onto my substrates when I print making it a pain in the *** to get anything done.