Dale,

You can check the don scott ratings against my system tester. I am not sure what your filters are but maybe I have them already on the site.

http://testyoursystem.000space.com/

If you want something specific tested I may be able to do it against my database if you post the filters here. My results only go back to August 2011 and are all betfair prices.

The top DS rating has the following results:

There were 58453 horse form lines in the database at this point in time. We update when we get time.

There were 5526 selections for the System
There were 5078 races for the System
There were 1288 Winners for the System for a strike rate of 23.31%
There were $5463.21 returned for WIN (after 5% commission) which means a Profit or loss of $-62.79 or a percentage profit/loss of -1.14%
Test Another System

The Rules used were : donScottRank = 1