Hang tight until Monday, extra day or two nutes won’t hurt just run the flush a bit longer. All I can say for sure when I switched to flush it didn’t dispense bottles 3, 4, & 5. I had grobo guys check my EC to confirm that it was in fact low where it should be for flush.
Option #2 if your buds are ready and must start flush drain and fill and leave bottles 3, 4 & 5 and connect with Grobo guys on Monday.