Hi,
First of all, great idea, IMHO a strong Vader is a great improvement to ANH. :)
I liked your videos, and I would like to make a suggestion, that (again IMHO) would make the choke scene perfect. Vader shouldn't release him in silence, it should say something like "Consider this a warning" or something like that. Of course, you will need to find the words in the movies and mount the phrase, but I believe that wouldn't be a problem. If you can't find it, you could try using that reading of the bible made by James Earl Jones. Luckily Vader has no mouth so he can say wherever you want. :)
Keep up the good work.