That would make more sense. Unfortunately with bad credit you’re always going to take a hit with the MF.
That doesn’t stop you from working a better discount though. Stay away from vehicles with added accessories. As @Jon said, they’re not residualized so you’re taking a big hit with them.
Work on getting a better discount and make sure the dealer isn’t padding the price with unnecessary doc or other fees. You can check the Edmunds forums for correct residuals and money factors (not positive they give out non tier 1 rates though).
I would highly recommend shopping around at other dealers and comparing quotes. Only deal via email/phone until you’re ready to go in and sign.