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Unless you PFD (paid for delete), you are probably going to see a major drop in scores, how much of a drop depends on how old the collections were and how often they were being updated.
Unfortunately, by paying these collections, the accounts are updated to show last activity So, if they had last been updated 2 years ago, they would have had less effect on your score than they will now with the recent activity (paying them off).
Eventually these will age again and your scores will recover and your report will definitely look better on any manual review...but I'm pretty sure you'll take a major drop in scores.
I should say that I had an old collection account that was being reported (updated) monthly. I suffered no drop in scores by paying this account as it did not effect the reporting date.
I paid directly to an OC a few weeks ago and the collections account reporting for the OC shows status of "Paid" and $0 balance. There was no change in my score. I was told it will be deleted eventually.
Unfortunately, paid and unpaid collections are looked at in the same negative way by FICO.
They will be deleted 7 - 7 1/2 years from the DOFD.