Andrei,
My post was not to mention that anything is "wrong" with what you did. It was well done. I wanted to point out to the OP where he missed it.

You pointed out that Michaels method missed the center profile (correct) but he got the other parts correct! Your method looked at the center profile, but "all the other parts were missed!"

It comes down to what is the outcome that he really was after, and that something has to change.

If he gets that part, then he should be on his way.....