Ok, it looks like I'm getting closer. I tentioned the long belts and realized I had the fan on backwards so switched that around and things are coming out somewhat better. I do still seem to have a few issues.
If you take a look at these pics, you'll see there is a bit of layer shifting around the eyes / arms, however i don't believe this to be loose pulleys as once it gets past those eye/arm details, it shifts back to where it should be, so it seems when a new detail comes into print, it's struggling to come back in line. Could this be over-tensioned belts? Given that it does this on the front and the side though does that mean all belts could be over tensioned?
Also, on the logo on his chest, there is a bit of stringing, but I'm wondering if this is just to be expected with the nature of the design (ie, it's bridging to mid air so there is nothing to hold it in place). That said, the bridging in his mouth also seems to have drooped a bit which I believe should have been able to print ok.
PS this guy was printed upside down on his head facing the back of the machine should orientation make any difference to your advice.
Cheers guys
Matt