Link your stats. That would help prove your point.I think you would be very surprised then infact how close those matches would be. If they were randomly picked teams, I am very confident.
Up untill high 60's into the 70's and beyond it is all about the grind and there are people of rank 40 far better than those ranked 60. That is it.
As the moment you're coming across pretty salty that you play on two accounts and one of them you've even been terribly unlucky and under ranked... Or conversely been carried and are over ranked.

Considering that the 70 and above is the top 3% too.. Where do you actually rate people to be "better than average"?