That's the ticket.
But more specifically, it's the moving accuracy that lets it down. 0.5 for Wehrmacht PIV whilst Sherman and Cromwell is 0.75.
0.5 is the norm for all tanks except the Sherman. The Sherman had 0.75 because real life they had gyroscopes that helped to balance the main gun while moving. No idea why the Cromwell was also given 0.75 considering it did not have this feature, either they used the Sherman as a base and forgot to change this, or it's just good ol' power creep.