Thanks Shaun.
In that case I,ll opt for a MINIMUM $3 +

Quoting from Malcolm Knowles booklet -"Weight"

"Runners carrying 55 KG or more account for 36.5 % of all runners but provide 50.6 % of the winners.It is stating the obvious where your handicapping efforts should be focused"

Hope thats of some interest to your rating method.

Cheers
darky