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Sorry, I have no experience with this. Someone should answer you in a few hrs. I did notice Experian as being the lowest of my scores.
Because the CRA's do not all gather and report the same data in exactly the same way, the FICO algorithm is unique to each one, and will seldom produce the exact same results with seemingly identical data reporting. As a result sometimes you will see such seemingly inexplicable wierdness.
All you can really do is try to address each derogatory item in the recommended fashion, I.E., PFD unpaid collections, GW paid collections, GW lates and other OC derogs on paid accounts, and PFD charged off OC accounts with balances. If something is not being reported correctly, use the dispute process to correct it.