Hello
I've had issues with light but only when my plants got a bit bigger than expected and were a little too close. Your 1st and 3rd photos make me think a lot of an iron deficiency, how it's very bright in the center of the leaf but then turns green as it grows out. If that is a possible culprit of the problem try Calimagic or some other cal/mag/iron product.
If you're certain its the light maybe reduce hours down to 18, i know that's only 1 extra dark hour but maybe that and raise light any higher it can go and watch for change.
Plants can only handle so much ppfd, but it varies from plant to plant. I would also expect to see some crispy leaves coming along soon if it's light burn.
Good luck with the problem solving. Happy growing. ✌️