your not doing anything wrong, with the twisted coils you can expect to get odd readings on you meter, as im getting right now. my trick is get the built to your desired ohms, then build the next coil to the same length then test before trimming the excess from twisting. this way i find i can get exact matching coils for a perfect vape
i did buy about a month ago about 50 ft of every size of A-1 ribbon wire from temco. i love this wire and have found it to produce the best results so far. i will be twisting this wire until im 100 years old, but im happy with it. my vape i take to work is a .6 ohm dual coil @ 3.7v ithaka with bobas bounty on a ggts which rocks, and then my home vape is a 1.5 dual coil @ 7.4v with bobas or gorilla juice and i have found my best vape so far. i did get some happy liquid from germany that vapes extremely well, but the ave juice for me has the best throat hit at 6mg on dual coil