coil building beginner

Hello to everyone,
I am new to coil building and somewhere somehow I am doing something wrong. I am using Ni80 30ga by vandy vape. These are my Steam Engine calculations but after I get to build the coil, my mod (geek vape aegis max) reads it at around 0.5-0.6Ω and even 0.374. Can anyone help me?
Thanks in advance.

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