Help with TSpipe, how to select handles of tspipe in grasshopper

Hi, there,

I am using TSpipe in Rhino to make a smooth look of curves. 

I want to change the radius at the end of the curves. What I am doing now is to manually select those radius in Rhino and type in a smaller radius. The outcome is quite good.

But I really want to know if there is a way automatically select the end radius in grasshopper? Becasuse I still have literally thousand of pipes to deal with. It would be crazy if I choose them one by one. That would be inefficient and also not accurate.

And my TSpipe component in Grasshopper is not working, there is always an error whatever I put into the component, and saying "Solution exception:Object reference not set to an instance of an object."  The version I am using is GH 0.9, Rhino 5.0, TSpline 3.4.

BTW, I am also looking for other solutions other than TSpipe, but in grasshopper, like ExoWireFrame, Cocoon, or mateball. The result is not ideal. Do you guys have any suggestions on this?

Thanks in advance.