If you can go as far as paying your half of the current mortgage and then popping the balance of the proposed mortgage monthly payment into a savings account over the next few months you would then be in a position to argue to the bank that you can afford it and they would look at you in a better light.
In other words, ensure that your combined current mortgage repayments and savings amount to 1K and you should be alright.
Before anyone shoots me down - this is what swung our mortgage amount for us, as our rent was 1K per month and our mortgage repayments were less, we could afford it, even though combined we were probably earning around the same as you mention.
HTH