well, i am at it again. I have been practicing scarf joints on some old mahogany floor boards that i have -figuring i should get it down as best as possible before starting a new neck. I'm in no rush... i've noticed that scarf on many different places on the neck. My MTD has the scarf about 1/4 of the way up the headstock. My Smith has the scarf almost right at the angle of the neck, and my taylor has the scarf in the neck itself. does one area provide better stability than another or is this up to the luthier ?