Do you have a picture of the salami? Could be a scenario where the meat isn’t as dry as it could be for paper thin. Also, there will always be some loss when starting a new salami, I used to slice a variety of meats and you typically always will have to cut some larger chunks off the end to begin.
https://www.reddit.com/r/Charcuterie/comments/11lni4t/help_slicing_meat_paper_thin/