AP I don't know how you can incorporate this but at this time of year any set of ratings struggle.
On the one hand you have rock hard fit "Winter" class horses meeting on the other hand not quite fully fit "Carnival" class horses.
Which tends to even the fields out somewhat.
If you can separate out the period from 1st July to 1st Sept from the rest of the year you may see some improvement.
looking forward to the findings from this exercise as it happens, as surely there has to be a way to get a quid out of this. (That has been my war cry for 30+ years by the way)

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Jose'.