[Woodz428]

I have to go along with Ed as well. At 1500 miles of street driving the clutch should be just getting worn in enough to need adjustment. Although it would likely get "tight", depending on the pivot point of the arm. That's another possibilty, if the pivot is adjustable and wasn't locked down tightly enough that could have vibrated out. The fact that it worked fine for 1500 miles and then began acting up, makes me think of adjustment. There was no comments about any "event" that would have created it. A few pics would supply more info than several posts could.
There is absolutely no possibilty of air in the system? I always c-clamp my slave while bleeding, it eliminates the clutch movement and makes it bleed like a brake system. It also seems to make the process much faster.