To me they look like they are adjusting to your system. I see nothing wrong. The deficiencies that I see will be gone once they settle in. The ph ppm fluctuating is probably causing it but no need to flush just keep the ppms low and the ph as stable as possible and wait it out. They will be fine. The damage is most likley old only worry if its on your new leaves.
Sometimes less is more and the more stuff you try could lengthen and or slow there adjusting and healing period. Stop Flushing and let them be they are still babies they just need some love. IMO