I think the reality is that no one can tell you your chances at transferring. You have a list of highly competitive schools. IMO, the advice to have some lower ranked options is sound unless you think you can stick it out at Williams if you aren’t admitted to these schools.
Have you explored how transferring in as a junior will impact your ability to get recommendations from pre med committees?
Be aware that some of the schools on your list also have grade deflation.
Wondering why you have Notre Dame on your list since it’s also in the middle of nowhere. Cornell, also is in a very rural area but significantly larger than ND. Thinking Penn might fit what you want better in terms of location?