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Since you have been on your job for more than 2 years they should be able to use your overtime and bonus income. It sounds like they aren't using it right now. Did you get an appraisal done even though you don't have to? Income really shouldn't be to big of a deal with a streamline. Let me know if you need any help. I would be happy to dig into your situation further to see if I can help you out.
The way I have always done it is averaged your last 2 years overtime and bonus income and used that number. The problem could be though on the verification of employment form. Your employer would have had to check the box that says overtime and bonus pay is likely to continue. If they said yes then it should be no problem to use it.
Worst case scenario there is always a "non-credit qualifying" FHA streamline that doesn't factor income, assets, or debts. Rate is usually 1/8%-1/4% higher, but it may be better than nothing if they wont budge on your DTI.