Designing a Tippe Top which spins the longest duration after Tipping!

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Hi
Today I and Jude(@jtd) had a great time tinkering with Tippe Top. This counter-intuitive toy mesmerizes everyone! The detailed physics of working of the toy is indeed a complex one and I would be happy if someone takes up the challenge to explain it in a clear and lucid way.
Meanwhile, we decided to change some of the parameters and design of the toy to see if there is any change in the overall time of spinning after tipping.
For instance, we decided to make the tail round to see if that will make any difference in the duration of inverted spinning? What do you think?
The parts are designed using open source 3D parametric modeling software - openscad. It’s easier to change the parameters quickly and get precise results.
The timing so far is 9 sec with the following model. (without slow-motion effect :slight_smile: )
What are the other ways in which you can make the same top (without using 3D printers)? Let’s see who designs the top which spins the longest!
The slow-mo video:

Here are two models with different stem sizes. Which one do you think will take invert and spin for the longest duration?

IMG_20191204_182455020_HDR
IMG_20191204_182455020_HDR4032×3024 389 KB

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If the end of the cylinder is rounded, the friction against the table top will, or ought to be, minimised, allowing for a slightly longer spin cycle. I first thought of pointy, but then figured that this needs to be very carefully tailored, so that the toy can still flip over, and there’s no great advantage, except to make it look even more mystical.

But if the rounding renders an arc that continues the surface of the sphere (for any circle on a plane cut through the centre of the ball), the toy will treat the pin just the same as any other part of the sphere, and can logically spin over onto it.

So, I don’t know why it is flipping over and then stabilising on the pin as as leg. Is it explained somewhere already? Is the density of the pin higher then the density of the sphere? Or is the head of the pin cleverly weighted from inside?

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Have not checked for explanations. It is a fine problem to rake ones brains.
No cunning sleight of material either.