I think you're absolutely right. Mine was front focusing wide open at close distances, and very sharp at infinity when stopped down to f/5.6-8, but didn't reach infinity wide open.
I send it back to Oberkochen mentioning the above remarks. They said it was perfectly calibrated, but nevertheless, they optimized it for wide open shooting.
It came back as follows: perfect focus wide open. Perfect infinity focus at infinity hard stop. The RF patch shows infinity before the infinity hard stop, this is where the lens is sharpest at f/5.6-8.
So when I shoot wide open at infinity, I just ignore the RF and focus all the way to infinity. When I'm shooting stopped down I follow the RF.
I think the guys at Oberkochen did a great job.