I have followed this thread with interest and to its conclusions .
It is a phenomenon I have encountered so many times ,that it is in fact the shooter not the gun, though many people still find it hard to admit to it .
It all comes down to mount , stance and gun control by which I mean the actual holding and grip on the gun.
Over the years and having done hundreds of gun fittings it has been my conclusion that 60% plus of shooters problems are they themselves and many problems can be overcome by simple adjustments to the individuals handling of the gun in question .