@ Andrea - Thanx for the kind words;)
Do you suggest that I use a different setting for the grain overlay and maybe boost it by a couple percent?

If you look at the screenshot comparison:

http://screenshotcomparison.com/comparison/84013

you will notice that the letters in the subtitles in the source are round when they need to be, whereas on my encode, it appears that the letters are a little jagged if you look closely.

This "jagged" effect can also be seen in this:

http://screenshotcomparison.com/comparison/84012

where you can see this also in the hat of the soldier standing behind the blue uniformed soldier, and it's noticeable in the red uniform of Col Monroe in the yellow stripes on his arm.

Furthermore, I'm not sure whether this is due to faulty de-interlacing or whether this is caused by the slight sharpening filter that I applied:0