After thinking about the flickering problem you were having, I had a thought. I can confirm that all of mine will flicker if something bumps the power switch, even just a little. So, yes, that's a little bunk, but if the chains are wiggling against the power switch, they will flicker. My inner chain ring is further out, so that's why I didn't see it. Putting a little bubbled wad of duct tape worked to prevent it.
Hope that helps.
I wasn't feeling defensive or bad that it wasn't awesome for you, I just like to give good advice. When my advice had a flaw along the line, I wanted to try to make it right.