I looked up cucumbers in one of my trusty Rodale "How To's" and it seems that
they like acidic soils (5.0-6.8) so I don't think that coffee grounds hurt your
plants. You do need to give them lots of Phosphate and Potasium.

How wet is your soil? Could your leaf browning be caused by fungus? That
would start with round spots and soft spots on fruit.

Someone may correct me but I believe "Curciforms" are leafy plants with
opposing leaves. The ones that we keep hearing are good for us: Spinach,
Collards, Turnips, Brussle Sprouts, etc

Ed.