Same issue for me, but I noticed the taillight assembly was wobbly before I removed it to install the Kisan. I'm thinking it's TADT (they all do that), because I remember reading similar posts on this site or others.
I'm getting the flashing yellow lamp warning when I apply the brakes right after startup, but it goes away after a few seconds. Andy at Kisan explained it as resulting from diminshed battery voltage after cranking , but said it is of no concern.
I'm going in for the 12k service on Monday, so I'll ask the tech about both issues and report back if I hear anything different.
2006 K1200GT - Graphite