I have been running a test to check the performance of horses which shorten a meaningful number of ticks on BF in the last few minutes before a race. That is the only criterion.
It has produced a sharp increase in the hit rate of the fancied horses as follows
Fav wins 41%
2nd fav 24%
3rd fav 18%
4th fav 14%
Each of these groups has made a level stakes profit so far.

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Dear Lord
Please let me break even. I need the money.