You can forget about swapping around shims and getting the results you want. It just won't happen.
Just do one head at a time----get the old shims down to where they need to be---you don't want to be turning the motor with one head apart.
2008 Yamaha WR250R---by far my main bike.
2006 KTM 450EXC
2014 KTM690 Enduro--we'll see how good it is after 70,000 miles.
2013 Husky 650 TR650 Terra