With regards to Alan stating that his speed figures stopped working on the AW racing surfaces, I have always dealt with this issue and made corrections using my going allowances.
Turf
Firm +0.50s/f
Good to firm +0.25s/f
Good 0.00s/f
Good to soft -0.25s/f
Soft -0.50s/f
Soft to Heavy -0.75s/f
Heavy -1.00s/f
AW
Fast +0.50s/f
Standard to fast +0.25s/f
Standard 0.00s/f
Standard to slow -0.25s/f
Slow -0.50s/f
The meetings link below has every meeting I have worked on including going allowances + winners that exceeded their official marks against my handicap.