[Atomizer/Ohm reading Hcigar VT200]

I don't think this problem has anything to do with the mod resistance. The device is reading too low. Adding mod resistance will only make it read lower and therefore be even more off. And as you said 0.05 is way too high. Something is going wrong somewhere...

[Atomizer/Ohm reading Hcigar VT200]

I have exactly the same problem on the vt200. I every tank or atty and every wire type reads about 0.05 too low. It makes temp control completely useless. As the 0.05 difference makes the device think the coil is much hotter than it is, temp control kicks in straight away resulting in next to no vapor.. if I lock resistance artificially 0.05 more atleast I can actually vape, just not with the sort of accuracy one would like.