Your question can be reworded as "My unit runs constantly, so what's wrong with it"?
Already you're trying to diagnose the problem yourself, when you should be calling a professional. This isn't a DIY forum. Not that it matters, because nobody on the planet can diagnose your system by the size of your house and the size of the unit.
For what it's worth, when the discharge air is at room temp it's harder to "feel" how much is coming out of the vents. I've had customers swear that "no" air was coming out of their vents when in fact the air flow was quite normal. Once getting the condensing unit running again and the air actually cooling, they could feel the air moving out of the vents again. Don't try to diagnose this system's problems yourself, cause it isn't likely to happen. Make the call.