At this point, minimal content has been sent so I'm not overly concerned with that as I have turned off the negative scoring campaign currently. We just launched an updated Nurture program this month.
I think looking for lead scores less than 0 and reseting them to 0 may be the best thing to do. That way any future emails will be scored appropriately and if they already did enough activity based on the limited content I sent, than their score is probably already over 0. Thanks for your input!