5/16 or 5/64? 5/16 is a pretty gargantuan ID. As for fluctuating... You have a loose connection somewhere. Check the legs and make sure one isn't loose.
I make mine for my VV device w/ 30awg kanthal, 17ga blunt needle ID at about 3Ω then crank it up
fixed
I make mine for my VV device w/ 30awg kanthal, 17ga blunt needle ID at about 3Ω then crank it up
fixed
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