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If you only have one collection reporting on each account and nothing else negative (such as late payments, chargeoffs, etc) you could theoretically get to 760 FICO if everything else was good and you had a well aged profile (over 6 years, I believe).
How many times did you offer a PFD to that collection agency?
Lates within the first year hurt for up to 120 points but combined with a collection I would say 700 is impossible until the lates are over a year and the collection is deleted. That late In December is absolutely going to hold you down until 2019 so hammer goodwill for sure.
In my research the highest I've seen for lates plus collection is mid -600s and even that is tough without everything else being perfect.
Hammer goodwill on the collection and lates and keep at it until they both say yes.