Im on grow 2, and in both made my own supersoil and use strong QBs.
My experience is i can run very strong through veg by transplanting at the appropriate time. In flower using this soil, even round 2 it yellows and fades and changes colors when it wants to. Is it deficient, could it be done better? Sure no doubt. But the points earlier that hydro is different is for sure the case.
The OPs issue, without a doubt, is the most classic form of light burn you can see in pictures. How, why and what happened I dont know, but no newbie has looked at more pictures of defs than me!
After a lot of reading i realized a great thread on light intensity (w and without co2) pretty much summed it up.
In hydro, they can boost CO2, feed and temps and the only thing that happens to them is DLI light saturation and diminishing returns.
In soil tell me how to turn up the feed exactly? I dont know! Maybe it can be optimized but that was my conclusion.
Basically this - at ambient CO2 - at somewhere from 800 to 1000umols is all they can take, and past that is not just wasted light. We cant force it to grow faster like hydro. It is light bleaching and the appearance of deficiencies in a soil that is not deficient...it just cant keep up.
Now everything I just wrote could be wrong, but that is what I have figured out so...
In veg where i maintain VPD i have no issues with light burn or defiencies and transplant twice, 2nd 10 days before flip. 50k lux +
In flower the plants will fade in color, yellow, red, look pretty and scary (to a newbie) starting around week 4. Not all out faded but dramatic steps and not just gradually. My experience, limited yes, and some discussions with more experienced growers is telling me to trust nature and let the plants fade. Dont feed them extra. Dont worry it should somehow be green until the end.
Thats my 2c. Probably wrong lol
I think 800umols is likely a smart top end. So im running about 900 now lol. Many growers in the threads i read had huge harvests at 600umols. More light is good, but not as clearly with supersoil grows.