The top 2 are a 0.049 ohm dual twisted Ni200 build in an Aromamizer, if the TCR is 0.00641 then ?R per degree C is ~0.314 milliohm, preheat was 100 W. The 3rd is a 0.224 ohm 0.4 mm TiG1 dual build in an Aromamizer, if the TCR is 0.00366 then ?R per degree C is ~0.82 milliohm, preheat was 100 W. The bottom one is a dual 0.5x0.1 ribbon Ni200 on stainless steal wicks in an Origenny V2, if the TCR is 0.00641 then ?R per degree C is ~0.3 milliohm, preheat was 80 W. All are smoother than the ss above, so I don't think resistance resolution is the reason as 2 of those plots have a much lower ?R per degree C. timescale was 10 sec, but cropped to 6-7, but they are all the same scale.