Quite right, any reasonable idea shared is better than none. Hence an alternate suggestion in my reply, which can be agreed with/disregarded as applicable.

To keep this positive, does anyone really know how the TAB ratings out of 100 are made?

As an example, in the All Aged Stakes on April 6th, Sunline was rated 100 and Cent Home next best at 94. I thought at the time "Yeah, lengths!!".

Turned out accurate in that case, but I am sure it is not the system used. Help.