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So smoother forehead = faster?
Depends on the yaw angle, the ridges might act as trips :-)
In a decade of tweaking , you could probably find 50 different things which have been changed, each of them accounting for a small improvement.
FWIW, over the same period, I've gone from 25:56 (2004) to 22:31 (2014) for my best 10 mile times, oddly both done on the H10/8 in Charlotteville promotions.
This is quite interesting. Massive changes in position over the years.
2004 Hutch (2005 best 10 mile time 19:11):
2014 Hutch (2014 best 10 mile time 17:52):