To summarize what I have found, All 4 decanters tested above the federal limit for lead in drinking water. The figural decanter obviously was much higher than the other style decanters, that is the only one I have so a single sample does not make a trend so I would like to do a few more tests to see if that style is generally higher in lead than the others. The newer decanter was 2x's higher than the older decanters, I find this interesting but again I would need to do more analysis to see if this is a trend. In the future I would also like to test a few older bourbons that were not from decanters to see what contribution the distillery itself makes to lead in the samples. Given the amount of piping and copper work in the distilleries it is a fair assumption to say some lead came from the workings of the distillery itself as lead was used in solder flux just as it was used in the glaze flux for ceramic wear.
So in total, the figural decanter will be sparingly consumed but I dont' see much of an issue with the other 3 especially given that these decanters usually contain "special" bourbon that really would never be a daily pour.