Pics are small because you are posting thumbnail resolutions. 85 x 150 or only 12K. Try for something like 48K min. 600 x 800.
But, best for this is 1 megapixel resolution or even 2, lets us blow up sections to see the detail.
You have give a lot of written detail, also.
I can say it looks like when I stay on Clonex too long rooting in, for hydro, the Cal/Mag deficiency shows up. But, are you root bound already?. How long has it been in the foam cup?
I do two thing according to what I see, but I can't see in your pictures.
The roots are not lifting water well, if the upper leaves remain corrugated. It lacks adequate Turgor Pressure.
So, It never hurts to transplant to begin a healing process. Just go slightly larger than your foam cup.
Then you can check your roots, also. Transplant will give an oxygen boost to the roots, but, will stress the girl into thinking she needs more roots. And I may trim the top to releive the pressure demand. Pull off leaves that are over 2/3 yellow, same reason. But, I can't see enough yet.
Don't over water.
Don't over water.
Don't over water.
Don't over water.
etc.