Ok, my bad. I have been looking into the new main degradation survey for all battery packs here:
Your calculation is wrong, because of two things:
- You should enter the 100% value of 534km, not 491km.
- By entering 491km the table assumes you have a M3P, which uses a different constant.
I have now changed your value from 491km to 534km and now it matches your result.
If you want to participate with more data I recommend using the new survey for all Tesla packs, that Ive linked above 
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