Hey guys. I just recently purchased a new H920 and when I turn the motors on, I see all of the arms shaking pretty bad. Not overly excessive, but definitely visually concerning. The craft still flies, but seems a little unstable at a hover, and I am wondering if this could be a cause. Do you have to balance these props? I also noted that after a 2-3 minute flight (no camera/gimble), the motors were awfully hot. Normal?