This might be better suited in the mortgage section vs. the rebuilding section. Unless you are trying to rebuild before you apply for a home loan. In traditional lending that credit score would hinder you from qualifying for the best rates and may cap your loan DTV.
I am self employed as well with a W-2 significant other. The lender doesn't care if you are a double income household if they can't put her on the hook for the balance as well.
You would be looking for a lender that does stated income loans with bank statements to be able to include her income. She might be writing too much off against the business. I don't even know if those types of loans exist anymore.
Last time I apped for a home loan by myself making about $80K base W-2 (rest of my income was volatile) and no debt, I qualified for $250K.
Good luck
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