I'm doing a bit more research into things as I believe I may have made a false assumption that the second parameter of the Analog Write is infact the actual duty cycle(time high). The article shows the second parameter being a value from 0-255 but this may be a result from choosing the frequency to be about 490Hz... More investigating.
A 490Hz wave would correspond to a period of 2.04ms which doesn't quite line up with 255us. It's off by about a factor of ten.
And... I'm finding really conflicting things. If anyone knows one way or the other please let me know. I believe this might be another one of those "by invoking these registers I've shot the defaults" situations.