Hey buddy :) I'm new to the topic too, but I will try to share the little experience I have made in the progress.
Ran into pH problems while rooting my clones, the effect on the leaves was similar to the problems you're facing. (made a picture of the leaf in a later stadium - check out my report 😉)
Also I think you need to be careful with the use of coffee ground. If using it you dont want a thick layer of it on the soil, but distribute the powder evenly over the whole pot.
Thats due to the tiny particle size of the coffee and its slow transformation into for the plant available nutrients by the microbs. With a thick layer it will be pressed together and create a waterproof layer on the soil.
Hoping for the best! Keep it growing!