I suspect that you still have some air in the clutch hydraulics. Try some more agressive bleeding. You may have a problem with either the slave or clutch master or even the clutch itself, but it is not likely.
You should also add some friction modifier to the trans fluid. It will not likely solve the problem you are experiencing, but the overall shift quality will be tremendously improved. You need 2 oz (half a bottle) of Ford friction modifier. Any Ford dealer should have it.
