Hi, I don't think it is going to be late a t all. however, if you are not currently in school, why can't you do more shadowing while you are writing ps and meeting with faculty for LoR?
Email/call local dental office which does a group practice, which will probably have long hours per day like from 7-5, do 10 hr shadowing for 2 days a week than you can boost 100hr in 2.4 weeks. It is hard standing whole day but 10hr at once make easier at the end...
also, letters can wait, so just write PS really quick, get revisions, and submit a few schools which doesn't have secondary quesitons. that way your transcripts will be verified in the meanwhile you are wirting for long many secondary questions for school like minneosta....
good luck! your stats are great!