One interesting experience, I have a Burkie 1015, 15' 10 weight from Brian Styskal. This very rod was built for his competition, so it come with 2 tips. One stronger and one normal... if you hold the two tips together side by side, you barely can notice one is thicker than the other one. The weights are so similar, yet, create different actions. Can you say the rod tip "mass" make the action change? maybe?, or the stiffness?!