The profile gasket can be found on this page (
http://www.realoem.com/bmw/showparts.do?model=AF93&mospid=47305&btnr=11_0156&hg=11&fg=10 ) Labeled # 10 the gasket sits on top of the lower timing chain case and under the head, so you would have to remove the head to get to the gasket. Like I said I am taking the opportunity to work and bring my engine up to par while doing this job.
My symptoms were as you described yours until eventually I found a leak from the front top drivers side corner of my lower timing case cover. I removed my valve cover, my thermostat and housing, and than my Top Timing Case Cover( #1 in this link
http://www.realoem.com/bmw/showparts.do?model=AF93&mospid=47305&btnr=11_2683&hg=11&fg=10 ) took a look at the middle where my my head meets the lower timing chain case and was able to see and pull some of my blown profile gasket. I do have pics of my find but site will not let me post them for some reason. This type of inspection might help you diagnose your situation.
This web page/site (
http://timthurber.com/tcpg.htm ) was a good start for me to get an idea of what I needed to do.
I can get you more info. and pics if you find this is the rout you will need to go just let me know.
Frank