Base Superior Jump is +2. A Book3 adds +3 so base Jump is +5. So since you are using a book 1 grade lower. There is always a chance of failure no matter what level you have.
Maybe for last 3 years you just had a tremedious string of luck with little failure. Or more than likely it is just the dice rolling against, so to speak. I get hot and cold streaks also. Normally when a cold streak starts I just stop compounding for a day or 2. As you mind normally amplifies the situation.
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