Just wanted to jump in and give you a few pointers from a earlier post I made. You are much better off to have your existing nozzles modified and reinstalled to the injector it was removed from.
I have seen up to a 45CC variance @ 27Kpsi /2.3MS on new units with 100% nozzles. In my opinion 45cc is huge. In laymans terms that is nearly 50% of max delivery on a stock 6.0 engine, which that 45cc nets 170hp worth of fuel..
That cylinder is going to run extremely hot compared to the rest at WOT. This is most likely why people are seeing random melted pistons. One injector flows 315CC and the next flows 360CC. Last week I did three sets with 60% nozzles and they varied from 285cc to 300CC. It seems to multiply based on the % of overflow. And this is using new nozzles that are balanced within one tenth of 1%. Also, it is good to trim the delivery on idle and mid range by changing the stack height of the Piezo. This nets a much smother idle.