Ah yes, asking the coordinator and not your attending. Classic mistake.You may not need to burn much vacation time. I remember that for most of those 4th year electives, they were happy to give me time off. I just arranged it with the attending, not the official coordinator. The prevailing theme was "it's 4th year, I'm surprised you're even here!"
If you are a competitive applicant, you can interview whenever you want and it will make no difference. You could take the first slot offered, or you could take the last.Went through this last year.
If you are a competitive applicant, November will probably be the busiest month for you since you will get the first dibs at interview slots.