Wow! I finally watched the whole video. I lost count of how many "centrifugal tops" you show!
I specially loved the circular scissor linkage tops.
The RPM of these tops should not decrease the same way as regular tops. The spin should remain more constant while it is contracting. I would like to see a graph of the spin decay 
Thanks, ta0! This video includes ~1/3 of the centrifugal tops I've made to date.
Yes, the dynamics get pretty interesting when a top can deform reversibly under centrifugal force. Next time I have a willing assistant, I'll record some spin decay curves.
Available observations: The mechanisms on the flyball tops at the beginning of the video can be locked in any desired position. In all cases, spin times are longest when locked in the fully extended position and shortest when locked in the fully contracted position. Unlocked mechanisms always give intermediate spin times.
These findings make some sense if you consider how CM height and the axial and transverse moments of inertia change as an unlocked mechanism contracts during spin-down. Changes in air resistance may also play a role.
