I know that James play it all with down-picking, but maybe can you try it with alternate-picking ? I'm an alternate picker and I can play Master very well and very relaxe this way, but don't ask me to play it with down-picking ! I will have to much tensions in my arm and I will not be in time after few bars.
I hope that it's help.
Jean-François Renaud
http://www.myspace.com/jeanfrancoisrenaudmusic
http://www.myspace.com/jeanfrancoisrenaudmusic