Yours look great. Either I have the wrong cultivar, or growing conditions make a truly massive difference. I tend to think it could be climate/conditions based, given the 2 different sources I have which both appear similar.
Here is the only Shanxi Li which has made it close to maturity so far this year. At least 1 or 2 others dried up early, something I’m seeing more this year (a few of the below So are like that). It is quite thin- thumb thickness at most.
Last year they were much thinner than yours as well, but thicker than this year. Maybe the amount of sun determines how wide Shanxi Li’s get, while the length remains relatively constant?