Thanks. When I posted that pic, I just converted from RAW to JPEG and cropped it so I could post it. I adjusted the camera settings in a RAW photo software yesterday, and now it looks even better.
If I am set up on a tripod, I turn the I/S off. Sometimes the image stabilizer may introduce vibrations while it is looking for what is not there. Otherwise, I leave it on, even though it may not work hand holding a camera below a shutter speed below 1/100. that would all depend on how steady you think you can hold that camera and lens.