If the fluid was pretty dirty, you may have a clogged reservoir and the fluid cannot get to the rear chamber fast enough. I went through the same process and problems recently as well.
I ended up doing two things. I replaced the reservoir with a new one. Mine had crud in it that I think was making fluid run to the second chamber too slowly. You need to siphon out the current fluid and then it pulls off rather easily. The reservoir is just snapped in to some rubber grommets, no other connectors holding it in place.
Second, I bought Speed Bleeders. I replaced the stock bleeder valves with these. They have an internal pressure valve that does not let air up the line, only fluid out them. Makes it easy to do the bleeding yourself.