You may need to add some more Mg to their diet. I see early deficiency signs on the leaves.
Looks like P. I don't see Mg. Bit of Ca, but I would correct the P first.
The mottled green. Spots. Scabby areas linked to spots in appearance. Serrations then boarders darkening. Twisting. It's all P I think.
Doubled your feed? that's quite a jump. I find raising my food will often see Mg go deficient first. Likely a lockout.
So, if the new nute solution and amount fixes my problem, can I expect those leaves to recover, or do I have to watch the new growth coming to see what they look like ?
Have you ever looked at your feeds, to see what PPM of what, is in them?