Help with creating guitar neck transitions

Hello Shapr3D wizards!
I have been trying unsuccessfully to create transitions between guitar headstocks and necks. I was wondering if anyone had some tips on how I coud best accomplish this with Shapr3D. First, a picture of what I am trying of accomplish, followed by the method I have tried to do this with.

Below is a picture of the volute area of the guitar neck circling the area of interest. The idea is to create a compound connection between the curved transitions of the headstock to the profile of the neck

To this end, I have tried to loft bodies, cut out shapes, union, intersect, subtracts, you name it. My end results just don’t produce the needed transitions. I can get the neck to a state where I can create the profiles for the shaft, headstock and heel, but the transitions are kicking my rear end badly. Below are a few screen captures at my latest attempt. If anyone can guide me with some suggestions, I would really appreciate it.