Hey! I'm a current M1 here, and to my knowledge, there isn't a quota for honors or near-honors. They don't curve, so anyone who gets a pre-specified grade or above gets H/NH. Hope that helps.
Also, regarding preclinical grades... I'd keep in mind that a majority of schools with P/F actually do keep track of internal ranking..
When I committed to Carver, the grading wasn't that big of a deal because of this. I knew lots of schools keep internal ranking anyway.
Also, with Step1 being P/F, preclinical grades may become more important.. who knows. just my 2 cents!