Sudden increase in mortgage rate between pre-approval and app

[Tom R.]

Yesterday my offer on my first investment house was accepted. That morning I received a pre-approval for a loan at 4.79% for a little more than I am paying for the house. Today I got the mortgage application papers to sign. My rate suddenly went up to over 5.1% and my payment went up almost $70 on top of that they want me to pay 1.5% in points. In all they want me to pay over $6000 in closing costs on a $80000 loan. This is unreasonable to me.  My credit history is good even though its relatively new 750 on Credit karma and my FICO is 760.  I will be contacting my local bank to see if I can get a better rate but I am also going to try and get this mortgage company to lower the rate. I noticed they didn't put all my assets on the application. They left off my 401k and my cars even though I provided that information when they asked. They are also claiming my student loan payments are higher than they actually are. What do you think my odds are getting a lower rates?