Those were varsity rankings, so its definitely an issue (having HS kids at those weight classes.)
However, I think that having more weights in the middle classes (i.e. 152, 157, 164, 171.. or similar) would simply ruin the competition level even more.
I know when I was in HS there were already only 2-3 guys at each weight capable of winning a title in the most middle weight classes, if you add more, it will basically eliminate any guessing as to who would win it and really just give heavier young kids a better chance at 4+ state titles (as opposed to it currently favoring kids who are smaller.)
In Ohio, its a completely different story. Ohio is much deeper than Minnesota is and could probably support such a change.