It's nice to see you're using the Special Collection. It's without a doubt my favorite OT LD set. I like you don't use filters. I'm always tempted to do so but they ALWAYS have negative side effects.
What capture device did you use for this transfer?
The rainbowing is a bitch. It's in my V800 capture and also in the X9 capture. It bugs the hell out of me. But I think it's partly (mostly?) on the LD itself because other discs (newer) played on the X9 don't show nearly as much rainbowing.