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First, no it's not that bad, I promise. Those loans would not have gone away and it's best that you got this taken care of, even though it kind of sucks. DTI is definitely going to be affected by your loan payment, but if the loan payments are too high, call to ask about an income based repayment plan (if you aren't already on one).
You would have not gotten a mortgage with a defaulted federal loan, it's about more than scores.
So, I have a few questions, if you don't mind:
1. Where are you getting your score?
2. Did you have an installment loan already on your report (mortgage, auto, personal)
3. Have these loans finished reporting? As in - they default has been removed and they're showing as open and being paid?
3b: Did they remove or keep the lates that led to the default?
Generally, scores increase because there's a good, old, positive tradeline on your account (reporting as installed). Having a high debt is not necessarily going to give you any problems, as long as your DTI (debt to income ratio) is OK. My debt jumped from 0 to 30k to 55k, and they didn't negatively impact me, except for the new tradelines because my revolving credit utilization stayed the same. Installment isn't lumped in with revolvers as far as utilization is concerned.
You really shouldn't have gotten a drop from the account. Was the point drop on Creditwise or Experian.
You would have gotten points for credit mix for having an installment loan (student loans count!)
Maybe give it a month or two to shake out? When my accounts came current, it took a little time.
If you look at the account history in Experian it should show you if there are lates.
This is from my accounts - I went to my "credit report" and clicked on the name of the lender, and this popped down:
You can see that all of may payments are ontime. The grays are "no data" and I think that lates are red or yellow (sorry, I don't have any right now to show). If the lates are still showing for you, you could write a goodwill letter to the lender asking them to remove that data (the late payments) for you. Some will do it, though not all will.
Student loan servicers are notoriously laggy about reporting all of their information. It took months for my credit report to get straightened out when I consolidated, and I had issues with my rehab as well.
Good luck!