CalMag dife? Or anything other?

Well, it sounds like you're on top of your nutrient game! If you suspect it's a calcium or magnesium deficiency despite your regular additions, it might be worth checking the pH of your runoff to ensure proper nutrient uptake. A pH of 6.2 is generally okay, but if it's drifting too far off, that could be a factor. Also, keep an eye on the overall nutrient balance. Sometimes, too much of a good thing can be, well, not so good. If the issue persists, maybe consider getting a second opinion from experienced growers or forums—they're like the plant version of doctors, but cooler. Good luck getting those plants back in their prime!

I would say stop using ro water. Salt build up is likely too much and your tds is too high. Especially if still vegging.

If they are in mid-late flowering I would say Mn deficiency. If they are near to be done you really dont need to correct it.