ISY Insteon switches unreliable via automation when calling multiple

Configuration
,
1

I have a simple automation to turn on four lights. These lights are all physical Insteon dimmers interfaced via ISY.

I get mixed success (some stay on or off)

  1. When I put all 4 in a group and trigger that
  2. When I address all 4 directly in the automation

I have success triggering (all off or on when expected)
3) When I go to ISY, create a scene, add all 4 to scene and address that scene in my HA automation

This leads me to think HA is sending too many commands to ISY in scenario (1) and (2). Anyone have experience with this?