I use the system Ernie showed you, with my D70 and Norman strobes, and it works just fine. I don't know where you're finding a "TTL" setting on the camera, I just put it in "manual" and turn the internal flash "off" (actually, now that I think of it, I'm not even sure I have to do that either). Even though the built-in flash is off, it still sends a signal across the hot shoe, which is what triggers the Wein.
I'm not familiar with the L8D, but I suspect from your description it is a "digital" slave, and for the life of me I don't know what that means. I do know that when I described my setup (D70 & Normans) to my strobe tech here in LA, he told me to forget upgrading to the digital Weins (I already had the one Ernie shows), which I did and it works fine.
Andy Pearlman Studio