I've got to be honest with you and say that i'm not seeing what you're seeing here, tests 3 and 4 don't look plasticy and shiny to me, they look basically the same as 1 and 2 except for the colours, where 1 and 2 have slightly more green in the blacks and slightly more red in the whites compared to 3 and 4. Most likely it is something to do with your monitor settings.
I'm happy with how the whole film looks now, nice and balanced colourwise, like I'm sure you will be too, as you yourself said here before about a clip where I used the same settings as in clips 3 and 4: http://originaltrilogy.com/forum/topic.cfm/kk650s-Star-Wars-Saga-Regraded-and-Semi-Specialized/post/690474/#TopicPost690474 .
Thanks for all the help and feedback on Star Wars, I didn't end up going down the greener path in the end but your thoughts are much appreciated!
Yes I think either my monitor or more likely my mind is playing tricks on me. Also I still think BOTH results are good= when it comes down to describing subtle differences its easy to lose the wood for the trees (!)