i havnt read the entire thread, but i used to have the exact same problem in my 240sx. it turned out to be a bad hard line. there was a tiny pinhole leak in it. i replaced the hardlines and problem completely gone.
but first make sure there is no air in your system. after a good bleeding and it still does it, chances are you have a microscopic leak in the system somewhere - in which case, replacing your lines will fix the problem. in my car, the leak was so small there is no way to exactly locate it. but it was there b/c after the lines were replaced the problem went away.
good luck.
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