Most people don't touch any of the bushings. If it was my car, I would loosen all of them. Whether or not you choose to do that is up to you, but it probably won't matter one way or the other if you don't do anything to the rear bushing. I would start around 6-8C and 9-11R and adjust accordingly. For the LCA brackets, you can run them lower with the Vikings, you'll just have to up your rebound settings a couple clicks.