Hi @HopelesslyConfused, I decided to start with Toggle Brightness and create a new macro with several enhancements including automatic adjustment for power transitions: Charger to Battery and vice versa.
I recommend you use the new macro as it likely has some other features you will find useful. In addition it has been much more thoroughly tested. Frankly, Toggle Brightness was slapped together and had a few rough edges. I've officially declared it superseded in the thread where it was posted.
I've posted the new macro in a seperate thread: Brightness Control