OVR Ratings affect on field play?

As I said in another thread, I was playing around with custom ratings. I found settings that I liked. I then used them and played a season 10 times with those ratings, which are generally a bit higher than the game's default ratings. Add to that I have players who, obviously, fit my ratings well. So with my ratings, my players are upper 80s-90s, and with default ratings they are anywhere from 70-90. After playing the test season 10 times with my custom ratings, I played 10 seasons with the default ratings. It turns out, ALL my stats were consistently worse with the default ratings set. So, basically, every player's abilities were the same... same speed, same intelligence, etc. The custom plays and playbook were the same. The ONLY difference was the OVR rating, based on my custom settings vs. default settings.
So, it seems obvious that OVR rating affects a player's on field play. Can you verify this for me? This would completely change my goals as a GM...
So, it seems obvious that OVR rating affects a player's on field play. Can you verify this for me? This would completely change my goals as a GM...