Would be interesting to take a sample of RP 3 / JF #3 NOW and compare with the recovered sample via GC MS as well as distillation range... and scouting for all those ex-PEK retention samples that will be hanging around from the last 5 years. There are only a few general possibilities for lowering the FP and they include, firstly, changes in the relative proportion of hydrocarbon components that SHOULD be there (eg wider than normal wide cut fuel) and secondly, the addition, either deliberately or accidentally, of hydrocarbon components that SHOULDNT be there (e.g. FAME). Then of course, there's the non - hydrocarbon components.
It would help if we knew which tests were done. If the material was on spec, what is the harm in releasing the data?