Once netted off the low ball,
a 9 handicap should get a shot every other hole
a 6, every third hole(randomly one of the three holes)
a 3, every 6th (randomly one of the 6 holes)
The idea that one can predict where another will need strokes is ludicrous....
Attempting to do it by difficulty, or by any other method can skew too many strokes in one area of the game, affecting Presses, and perhaps creating a situation where the match ends before a weaker player gets his shots.
Having different stroked holes for Stableford purposes is just way too much (useless) information.
There's no such thing as a "typical" 9, 18, or even ascratch player