How to adjust a set of Herret target grips on a 1911

HI, is there a proper method of setting up or adjusting Herret grips on a 1911 pistol, or is it just a feel thing?

Adjust the shelf so it is providing comfortable support but not annoying or intrusive. The width of your hand is going to vary day-to-day and even during the day, so don't be surprised if you feel the need to adjust it a few times for best comfort in most conditions. Consider it slightly easier than jetting a carburetor.

A couple of coats of Formsby Tung Oil will make it less slippery.