I think I may ahve figured it out..... I compared the two reports and found a difference. The 786 report had only one negative factor and that was an account opened 6 months ago. The 756 had 2 negative factors: an account opened 6 months ago and also a short credit history, oldest of 8 years ago and average age at 3 years.
I guess once the collection was removed the age of the accounts became a bigger factor and that dropped the score?
Starting Score: 570