You have a 4.0 and a 524 - that leads me to think you can analyze that there is nothing iffy about your ECs. Also leads me to think that you know there is no difference between 3.9x vs. 4.0. Though I get that being pre-med is just living with stress constantly, this level of insecurity is detrimental and will follow you throughout medicine. And for the record, you will get many interviews with your list, which is appropriate. You don't need a gap year.
If you're looking for suggestions, Toledo and NEOMED should be a good safeties as you're from Ohio. Furthermore, UMass might be a bit low yield, replace it with some other mid-tier like Miami, Einstein, Wake Forest or whatever you'd like.
You can also add Duke, Northwestern, Sinai, Hopkins, Harvard if you desire.