This method is good for safety by finding the pressure point, but won't give you the best ES (unless by chance). I would be more interested in the results of each step as you made your way to the pressure point. Rather than simply backing off a grain, go with the charge that gave you the most consistent velocities and where slightly greater and lesser charges on either side did not change the velocity radically. This method won't give you the top velocity, but will give you better ES.I run an initial pressure ladder to find pressure and then back off about a grain
It goes without saying that each charge step up to the pressure point needs to be a group (5?), not simply one shot.