I dont think you're wrong at all. I played a TM in matchplay lastnight, and obviously the green speed shows as Tournament, but my putts were coming 0.5-1.5ft short for the first three holes.
I changed my read to Very Fast, and they all landed in the hole, something is DEFINITELY going on, anyone can argue the fact, but its been seen by quite a few people.
I even got a calculator out and tested the green speed, hitting the appropriate speed and still coming short with no break.
I used ((Distance+2ft)*0.7) = Total. Obviously subtracting a FT for every foot downhill and adding a FT for every foot uphill. Fell short on three attempts
Changed to *0.8 which is Very Fast green speed, and Perfect. If I did miss, it was only 0.2-1ft past the hole.