No, there is no backlash for putting too many of your class into X field. One year my med school put a HUGE number of people into Derm (huge for derm that is). They were about 4 years ahead of our class and they were still talking about how that class single handedly took up X percentage of all the derm spots etc.
In my class we had 13 out of 54 go into General Surgery.
Normally our med school has over 60%, usually closer to 70% go into Primary Care. Since our med schools mission is to produce primary care physicians our class put a signifinant crimp in that as I think only about 40% actually went into primary care. The med school administrators were happy we all matched well, but they were hoping that more of us would have picked primary care, that was obvious. However, it didn't matter to the match.
Of course there is some natural stratification in that board scores determine who matches where as well. Many a med student had to match into a different field because they didn't do well on their steps/grades.
Programs do get reputations based on what kind of interns their school produces and that also effects the match. If your school has a reputation for producing good, hard working residents then that school will match better than a school with the reputation of producing lazy/coddled interns etc. That part does happen, but that's simply residency programs and their experience with interns from a med school, it's not retribution for "matching too many" etc.