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Kano, since you are so great with numbers, did you happen to run your own numbers to compare with what minergain has? I have offered many times to have anyone review the data for accuracy (with no takers), so just curious if you came up with similar numbers or are interested in seeing the raw data?
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I go by my numbers KDB generates on the web site.
It's complete for each month, and specific block ranges.
There's no 'vague adjustments' to make it look better (or worse) it's just the numbers as shown.
Each person's reward will vary from the PAPPS% since the pool is PPLNS not PPS.
That's what the 'A' is - average - average over all miners (PA = pool average as it says)
If you mine constantly at a specific hash rate, is should be VERY close to the PAPPS%
But no one does that

so it varies up and down a bit, and varies more depending on how variable your hash rate is.