So, this soprano thing has been a blast except for right thumb pain. After trying different angles on the thumb hook, I decided to try something different. I found some pretty dense foam in my shop that is firm enough to shape and attached it with some double-sided tape (pretty strong stuff I use for attaching router templates). Anyway, great improvement and over time I expect the foam to conform a bit to my thumb position. After reading some other threads on this issue, it seems the two biggest causes of discomfort for me (besides the unavoidable weight of holding a straight sop) are the curved hook and the lack of angle on the body of the horn. You can see in the pictures, I left the top to basically just fill in the curve, creating a flat surface to allow for a bit of mobility, while the vertical part has an angle to allow for a more natural angle of the thumb to the body tube. Anyway, it's pretty easy and cost effective to try out, so I thought others might benefit from this. Merry Christmas all!