This is a horrible idea for a number of reasons:
1. Residency directors don't care about preclinical grades for the most part. Grades are way down the list of things directors look at behind step 1, M3 clinical grades, M4 away rotation grades, LORs, research, school reputation, and even some medical school ECs. Yes, a few competitive specialties favor applicants with AOA (with is determined in part by preclinical grades) but even that isn't nearly as important as step 1 and clinical grades.
2. Nearly all top tier schools are moving to P/F which means you won't have to worry about the competition anyway.
3. Your step 1 score is the main factor in residency applications. The score you get is mostly a factor of how hard you study, not which school you attend. That being said, its much easier to start reviewing earlier and focus on boards relevant material when you don't have to worry about grades at a P/F school.
4. If you're interested in competitive specialties, the research opportunities and connections you can make at top tier schools can be very helpful especially if your step 1 or clinical grades are below average.
5. School reputation does play a small (but significant) role in residency applications.