And also just in general areas of tight transition bends like these here:



can be easier to initially model as sharp and then use filleting to generate the rounded transition parts instead of trying to build a single surface that goes through multiple transition areas like that.

Take a look at the attached 3DM file which shows a progression from doing an initially sharp cornered shape, then applying fillets, then cutting with a side profile. Hope that might be close to what you are looking for.

- Michael