... its goals, then a URM applicant would probably get a considerable ... boost over a non-URM applicant, but they wouldn't look ... a 'prefer not to say' applicant and think to themselves, "this ...
As you are Hispanic, you can certainly claim URM status. You determine if you want to select that box and no one is going to dispute you on it. Schools will be happy to have another URM applicant rather than act as ethnicity police.
Also, January is a long way off. You can certainly improve considerably between now and then on the LSAT and become a much stronger applicant. Have you fool proofed LG yet? If not you should be able to improve there a good bit between now and January.