Good news is, your plants are not burned too bad. I overdosed mine several times before I figured it out. You've flushed with water and that's good, just remember that the affected leaves will NEVER recover. Don't think you did the wrong thing because they aren't getting better, the new growth will be beautiful and cover up those damaged leaves before you know it. The affected leaves should not get much worse either, and when you see them get flat and papery in texture or start to yellow in the veins it means you need to bring back the nutes. Paperiness and yellowing are signs of potassium and nitrogen deficiencies but it is way better to be deficient than burn. If your leaves are waxy and shiny which they look like from the pics, it's not deficient. The most important lesson I've learned so far is that it takes at least 2-3 days to see what effects your treatments have on your plants. So if they're burned and you flushed them, it will take 2-3 days to stop burning. If they're deficient and you feed them, they will take 2-3 days to recover. So you've done the right thing, I'm sure of it. Now all you need is a little patience and they will get better.