Need wiring help for weird 3-Way. Neutral in one box, but jury rigged 2nd box wired through the bulb

[stu1811]

You should setup group 3 and 4 in both directions. Total of 4 associations.

This quote has some good details on the different association groups.

@Chris

To explain:
The association groups send different data. Group 2 sends a BASIC_SET command- the Z-wave dumb ‘turn on’ or ‘turn off’ that will work on almost anything. Group 3 sends SWITCH_MULTILEVEL_SET, which tells the switch what actual level to set to (0-99). Group 4 sends SWITCH_MULTILEVEL_START/STOP_LEVEL_CHANGE, which allows ‘live’ dimming.
Everything Group 2 does (on/off), Group 3 does better. A Group 2 assocation will carry on and off commands over, but a Group 3 association will keep the two switches actually synced up including dimmer level.

BUT the really important one is Parameter 12. P12 controls association behavior- what data is forwarded to associated switches. By default it sends everything, including data it gets from other associated switches. This creates a loop- you do something on one switch, it gets sent to the second switch, which sends it to the first switch, which sends it to the second switch, etc etc etc. Setting P12 to 11 on one of the switches breaks that loop.