Are Zigbee with a ZWave chip added. You must include them correctly or they don't exist on YOUR ZWave mesh.
Are those the ONLY wall powered ZWave? No in-wall Switches, Dimmers or Outlets?
Because you are describing a poor ZWave mesh, despite having what sounds like a good attempt.
It's a challenge to do but the only serious way to evaluate your Mesh is via ZNiffer.
Costs $40 for another ZWave USB stick and you flash new code onto it. It's forever a ZNiffer then. You then run the ZNiffer on your PC and watch the traffic. You can see if it's taking the path you imagine it should. You can then physically adjust your repeaters to optimize.
There's a whole topic for ZWave Zniffer.. this probably is better off over under that topic...
