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Most FHA lenders require a 620 midscore, so no matter why you're a point under, it could be cause for denial. It's the numbers that they care about.
So you need to add a point or two to your score? There might be an easier way to do that, depending on how much time you have. Do you have credit cards with utilization over 9% on any of them? Knocking that down using the AZEO method would likely give you 10+ points. The only issue is that you'll have to wait until they report.
I called Quicken Loans last year when I was looking at building a house and they flat told me that if our score was below 620, they couldn't help us. We were at 579 at the time of the inquiry. I went with another Mortgage lender and our mid low score was 647 when we closed, about 9 months later. I would look for another lender personally, maybe a local one that don't use overlays.
My understanding is if you have an overdraft and you are attempting an FHA loan, it can kick you into manual underwriting.