Well there's source code included with that shader. Time to start learning MR shader code it sounds like :P. Either that or find an interested programmer.
It's a Max/MR issue that existed almost always. Only solution is to install XNormal, and use it's PS plugin called Dilation, to do the padding manually.
Close enough ..Mr Schulze... 8 Cloverfield Lane it is It's a great movie..definitely worth a rental..John Goodman is fantastically creepy in it. you're up