Well with information you gave, with no helix numbers, spring color,grams of weight...etc, I would say its obviously overshifting and then cannot recover from the overshift from (A.) secondary helix finish too big (B.) secondary spring not enough spring rate to hold back the overshift (C.) too much weight in the tip of weights . The 9100 right off the bat is from breaking the track loose and therefore overshifting, and then the motor cannot recover. Of course, this is only based off the information provided, to further look into the problem, theres a ton more information required......