Is it easier to get in with a smaller major?

Unless you apply to a school that accepts by majors, admissions officers are well aware of the fact that you can apply for one major and change once you are at the college. I’ve heard college admission officers say that they don’t pay much attention to intended major in the admission process since about half of the applicants apply undecided and about 50% of those coming in with a designated major end up switching it while they are at college. There could be an exception if a student has a long standing and demonstrated history of interest/aptitude (perhaps through ECs, research, classes etc.) in some obscure major.

Keep in mind that any ploy you come up with to try to get an edge in admissions, college adcoms have seen thousands of times over. IMO your time would be better spent searching out a group of reach, match, and safety schools based on your academic stats that appear affordable and that you would be happy to attend.