I'm interested to see if the bumps can be explained, so I will check that. If you wish to make as a shell, then you can model the tube out the outer diameter, insert a thickness object under geometry and then click on the right arrow and change to function and type an equation like I have done to change the thickness from .002 to .001. You need a coordinate system too for the equation. Repeat for both tapers. You then specify the offset to be bottom (in my case bottom, may be top depending on how the cylinder surface is created).
You then get something like the below which looks like solid, but is a shell with thickness effect. Ignore the right side as I did not do for other taper. Also, I started with too small a tube diameter so it looks so chunky, but you
Please try this and circle back with feedback or questions. Thanks!
Regards Sean
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