Could it be that you are getting better contrast in the case of the sized print simply because of the sizing itself. There seems to be hardly any blue in the print (except outside the image) so perhaps most of it is getting washed out. On the other hand the unsized print looks toned as would be expected. I am not sure I understand why that was not acceptable. I think Calvin recommends using a clear PMF as a size if I remember correctly.
Thanks for the video, by the way.
:Niranjan.