You don't need the extra shim for running 30%. The motors are shimmed for up to 30% straight out of the box. The extra .2mm shim is just for lowering the compression during break in period. Once the majority of the initial metal pinch has gone you can remove the shim. Don't leave it in for too long - around 12 - 15 tanks depending on your break in method will normally be enough.
If you are running 30% it is a good idea to go to a medium temp plug with the higher nitro percentage.