A couple of things come to mind:
Since you replaced the master, slave and hydraulic line; make sure all of the connections are properly threaded and tight so as to not be drawing air into the system at those connections.
Make sure the fluid level in the reservoir doesn't drop too low while you're bleeding the system. If it does, it will draw air into the system and you'll have to start over.
Finally, for me at least, it sometimes helps to just step away from the car for a couple of hours and let my blood pressure return to normal. Many times, that's all it takes to get the job done...
