Creating a path for the tubes

Hello All,

I am having an issue with blending the surface in Rhino
as edges are not smooth. we have to create the path for the tube but the blending is not happening. As seen in the screen shot we need to create the path that is blending , referred in second path but its happening with curve and line. we tried blend, match, join, sweep but it is not working. I have attached the file as well for the reference. Can anyone please guide me.

Rhino_NL.3dm (7.8 MB)

Hello- you can make a big FilletSrf, say 300 radius, but the more complex surface at the left is pretty messy - - if it is meant to be smoothly continuous with the more cylindrical surface, it is not (so the fillets will not meet nicely) - and IMHO could be vastly simplified.
Rhino_NL_Maybe.3dm (1.5 MB)