Hi,
thanks for the detailed pictures, this helps to understand your issues.
-Please make sure, if you can find similar morphs in other sections.
Those morphs doesn't neccessarily have to be in the "morph/waist" section!
Maybe you find sections named like "waist_reloaded", etc.
-Please have a look at other "body part" sections, too.
For instance: in "morph/hip" you will find morphs to adjust the height and length of the hip and pelvis,
which will also adjust the height of the waist! In the "upper body" section you may find morphs to scale the upper torso, aso.
-Sometimes you will need workarounds to do a certain body shape. For instance: If you use the "body scale" and "height" morphs in "morphs/body", you can adjust the body proportions. Use the "morphs/head/shape" morphs to adjust the head size after this. You can mix different full body morphs, and remember: you can dial in negative values, too!
It is a bit difficult to give an answer like: you will find morph "xyz" in section "abc", because due to the many custom morphs around and the different names those have used over the years, plus the ability to sort out morphs in different sections, only maybe the build-in standard morphs are somewhat comparable.