You may want to look at the bare boards coming in.
It is probably a case whereby the fabricator has too
much solder at the "buttline" through his process and
it will be extremely difficult for you to prevent the solder
from encroaching the fingers without  taping.  Taping does
not always work either.  My suggestion is to go to
an organic coating.
As another clue, your assembly vendor is having a
very tough time getting boards into their process
without solder on the fingers already.  I will get in
touch with you off line to discuss this.

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