Your first sentence is why we're confused. I think you meant to say:
"I put the bulk of my pay directly into
an IRA my 403(b), and then additionally put 4K into a vanguard IRA"
Anyway, the search term you are looking for is "recharacterization". This is something Vanguard can easily do, though you might want to speak with them first. They have a form at
https://personal.vanguard.com/pdf/s220.pdfExample 2 at Investopedia almost describes your exact situation.
It needs to be done before the 2014 filing deadline.
If I were you, I might recharacterize the entire $4k amount to a Roth IRA. Not just because that avoids having to deal with the earnings as described at Investopedia, but because the amount that you'll be taxed on that $1k is extremely low. To answer "should I contribute to a Traditional or Roth IRA", you shouldn't ask "will it reduce my taxes today?", you should ask "is the tax I pay today lower than it will be when I withdraw the money in retirement?"
And are you sure you'll even be taxed at all? It seems you should be eligible for $2k worth of the Savers Credit, reducing your taxes to 0 even if you don't deduct any IRA money.