You may be removing the parameter from the wrong place. Find all places where this parameter exists, and delete it from all of them.I removed w= parameter from the bluririsremoteview.js (there were 2 different lines containing "w=") and now the image is coming back even smaller, this time with a link like this.
/image/ENT?time=1418863008082&w=955
Now that you've pointed me in the right direction I'm sure a little bit of playing around with it and I'll figure it out, but as far as I can tell (unless I'm doing something wrong, which I might be) removing "&w=" parameter (and/or any character functions directly related to it) doesn't give the full resolution image.
Thanks again