I love the colors of Octavia.

The torque provided by the whipping action is proportional to the radius. However, the moment of inertia increases with the radius squared. In particular, for a thin cylinder I = m r^{2}

Therefore the angular acceleration from a whiplash decreases proportional to the mass and to the radius. In other words, big whip tops are difficult to keep going.

Looking at the video, my intuition tells me that the whiplashes are puny with respect to the top. The only solutions that occur to me are:

1 - Heavier/wider whip material

2 - A non-slip coating on the top

3 - More frequent whipping

About point 3, I suspect that shorter whips that can be swung more frequently, could be more effective. Tthey may also allow a third player to be whipping.