I did the graph, and it comes with the following notes:
-I noted the data of all three runs, and it all appears to reproduce very well. I thought that at least the third run would show some damage (lower output, altered Vf) from the second run mayhem, but looking at the numbers now, that appears not to be the case, the led keeps performing equally well. The graph shows only the data of the second run.
-I can compare the measured Vf up to 3 amps to the official Cree data, and I measure 0.2 V higher, which is significant. For the higher currents there is no available data, also Match did not publish Vf data of the MT-G2. I don't know why the results differ from Cree (is it real, did I measure wrong, is my -not really trash-quality Amprobe- DMM off by 0.2V, is there a big influence from the Noctigon board?). Well, it is what I measure.
-At the end of the test run the though sizable heatsink was just too hot to touch, so temperature may have an influence on the higher current readings (but then, in your flashlight build that will only be worse, so the data just are more to the point as they are now 
)
Here we go:
