Hi ablebodied - I'll kick you off with a couple of thoughts, not that I'm the best qualified.
SkinStudio6 hasn't really left the ground when it comes to tutorials and documentation. The good news is that the basic principles of creating a Start Panel remain largely the same as SkinStudio5 - it's just finding your way around is different.
There's a link below to some older guides.
Click Me for some Older TutorialsThere are also some good guides to be found at
Click me for skinartistry.com.
These are in the members section, so you'll need to join to access these. They may help clue you in to some of the key principles. Tutorials will however only allow you to walk a narrow path, you'll need to play a little to get the feel of how margins etc. affect outcomes. Be prepared to accept that not everything will work as expected, some things are just about building an encyclopaedia of knowledge over time.
A couple of things that might cause distortion and ill fitting would include not having the correct 'Height of Part' and/or 'Width of Part' entered in SkinStudio. Have a look at the 'Extra Settings' or 'Code Editor' tabs for these settings and see how they compare to the size of the individual parts you are importing.
Similarly distortion can be caused by stretching an image in a way that's not pleasing to the eye. Depending on the image this can be amended using the 'Painting Margins' tab or again by going direct to these values in the 'Code Editor'
If you haven't found it already, you might consider going to File > Substyle Management to create duplicate substyles of your work that you can experiment with and then delete without affecting your original work.
Hopefully others more experienced will be able to offer something more concrete. If you can provide screenshots, these can help attract others to your questions.