disputed some collections, asked asked Discover if they would re-open my charge off

My average score is 627, my highest is 650 with Equifax. I have a few things in the works right now and I was wondering if you could tell me maybe how much my credit score will jump if these things get through. My girlfriend and I are thinking of buying a house. Her credit is 800+ but I make more money. Do you think we'll have trouble?1. I have disputed some collections on my report and sent letters to the bureaus. I have not heard anything back yet. It's only been a few days though. Most of them are paid (there's like 4 total) and I know they probably won't come off. 2. I have sent a letter to Citibank (student loans) to ask they remove late payments as I have paid on time for the last 24 months. The late payments were from 2005 - I have turned around and paid over the maximum every month for 24 months. 3. I had/have a charge-off with discover. I called and asked if they would either re-open my account if I sent them money, or remove the item from my report if I paid. They said all they could do was report "paid in full / settled" on my report. I said that was fine. I finished paying that off yesterday. They have sent a letter to the CRAs to update the status. How much can I expect my score to jump? Only #3 is the "for sure" thing, the others might not happen.
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you could go up to 700+

if
nothing shows negative for the past 24 months with citi bank
and
you have 3 lines of new good credit paid down to less than 80% balance owed to high credit limit.