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
You may be removing the parameter from the wrong place. Find all places where this parameter exists, and delete it from all of them.