Arnie.d this sounds like a wonderful project you've undertaken.
I was disappointed when dark_jedi discontinued his second SC project, although his "HD2DVD" endeavors probably seemed like greener pastures to him at the time, and I can't fault him for that.
I'm very excited to see your results.
Two months ago I picked up an LD-V8000 thinking I might have a go at preserving a couple non-SW LD's. Prior to that I spent some time using the Dark/Sega ANH as an example while teaching myself manual IVTC using native Linux tools. I quit after the first reel, but to some degree I can feel your pain brother, and I don't envy you the task of IVTC'ing the whole movie.
Regarding haloing, do you suppose a cable impedance mismatch could be affecting it?
Didn't you say you're using a BNC/RCA adaptor? Would that be an RCA cable with BNC adaptor on the LD end?
I wonder if you'd get any different results using a true 75-Ohm BNC cable with the adaptor on the PC end?
Any chance you could post a snapshot of your LD-V800 rear panel? I'm curious to compare the connectors with my LD-V8000.