Hi Sahasastar,
I think what you may find is that your SR may be stable over time ,but your average div will fluctuate , month to month .
This is what I found with my systems grouped together, all 100 of them .

I feel it almost imperitive to use one of the best TOTE bookies .e.g. Dialabet best of 3,IAS best of 2 , so as to maximise the POT (profit on turnover).

I found the odd month that had the normall average SR but the divs were realy low for some reason which ment I broke even instead of a profit of 20% if betting with an online bookie.

Check it out.

Cheers.

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Cheers.