Thats weird, I feel like mine is a very nice white, could using the 10440's be changing the tint somehow? I feel like I heard someone say that leds can sometimes change tint when they are run with too much voltage. I've never really noticed the pwm, but my gf can see it. I def wish it was less ringy, but too be fair I mostly notice the ringyness when I am playing with it in my house, when I've actually had to use it out in the world I don't notice it anyone near as much, I think part of it is the rings just show up more on white walls. As far as exchanging, I feel like using 10440's voids the warranty, but I guess you might not have to share that info unless they can tell from inspecting it.