I haven't taken his course but what you describe is what I do:
Ring finger on 1st string 3rd fret
Index on 5th string 2cnd fret
Middle on 6th string 3rd fret
If you can pull off the 4 finger G using the pinky it darkens the sound a bit. It's tough to do though and I never mastered it.
This year the diet is definitely gonna stick!