Yup, blue light is like the temperature gauge in your car being pinned all the way past H. P7's generate a LOT of heat when driven hard. I just looked up your light and they claim 1.8 amps, P7's can be driven up to 2.8 with proper heatsinking, so you definitely have an issue. I've noticed that if you blue an led a few times, the output drops considerably and the tint will tend to skew towards ugly blues, greens, and even milky yellows. It will also significantly shorten the lifespan of the die.
You can always just get a new led for the light, though, they're pretty cheap these days, and you can pick whatever bin and tint you want if you end up having to go that route.