I know I'm not gunna answer your question but I dropped in a full ohlins insert and haven't looked back. Greatest upgrade I've ever done to a bike.
I'm sure Racetech could give you their stack specs. You should try their customer service. I would like to hear what you think of the fork valve kit. My rebound adjustment is nearly all the way in. I need more adjustment. Obviously a stiffer rebound stack.Is there a link from Jason or Farrell describing the setup. That earlier WERA link posted is no longer available. I am pretty handy servicing forks and installing valve kits, just not proficient enough if i need to modify the shim stack.
Are you looking for specific shim sizes on the compression or rebound on a 2013 ZX6R? Do you plan on using the stock piston, because that wont work with Race Tech shim stacks.