Its does not seem too far from the truth, but there is some strange stuff going on. Look at "RIP V" in the spreadsheet.
XM-L2 U3 went all the way to 4,27V. Most U2`s said farewell around 4,05 (+/- 0,07v). Something strange with that U3. Djozz`s U3 were quite similar. I dont know what to make of the U3. I dont like to push any of the XM-L2s beyond 4V. That is danger zone. But maybe not so dangerous for U3???
When it comes to new T6 and all U2`s Ive tested. If the Vf is 3,78 @ 5A or higher, then its not suitable for really high amps. If its 3,7V or lower, then its good.
RMM, have you come across any XP-Ls that could not handle 7A? Or have you noticed any with extra high Vf compared to the average? So far everything I have seen seems quite predictable and fairly consistent.