Welcome to Android Central! By responding to this thread, you have bumped it to the top of the J Series subforum that it's in. I think it does temporarily bump it up in the New Posts list, but since we get so many new posts per day, that can quickly drop down.
The haptic feedback setting for the keyboard app should be in the keyboard app's settings menu (and not in the system settings menu). Is the phone set to a completely silent mode? Have you tried a different keyboard app?