I think your own experience and that of Sparkitoff pretty much tells you that there is a lot more to it than twist rate. There's a lot of "conventional wisdom" out there regarding ml guns and even when actual results contradict it.... well, somehow it lives on! Some other factors that should be considered are barrel condition (does it cut patches), Muzzle condition (again, is it cutting patches when you load it!), the quality of the patch material, and some others I'm too lazy to conjur up! All the factors that effect any round ball gun regardless of twist.