We just hauled our Harley Ultra Limited to Sturgis and back in our 2015 Impact 311. I use 2 3000 lb straps on the front fender/fork tubes, and two more coming off the floorboard mounts to the rear. The bike wiggles around, I'm sure, but was totally stable each time I stopped and checked on it. I agree with the rest that you may be using too much strap for your needs.
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