I don't think the foliage shows any common nutrient deficiency. I seem to remember the yellow central vein indicates root problems.
Not sure if you over did the acid, but at low low pH, the acid will attack the roots.
Don't know if what you did would drop the pH to that level, seems unlikely.
It may however encourage acid loving microbes or those that degrade organic matter via that process.
Thinking out loud, that may be the problem.
I have seen similar when unusual microbe growth takes over pot mix.
Coffee grounds are fine, but not all at once in my experience. They can lead to a microbe mass or mat, especially on the surface of pots.