I have a DNA200 and a SDNA75 and i have had a lot of problems with fluctuating ohm when using SS316L from UD. I resently bougt a Serpent Mini and at the same time some Geekvape 316L and I do not have any problems any more with the SS316. Steady as a rock in Escribe and the vape is smoth and just as it should be. At first when I got my SDNA75 and the new escribe software I was very disappointed, because I did not get the Vape that other users wrote about still the same crappy up and down with the SS wire, but after I use the Geekvape I really get a great stady vape. The only prob with the SDNA75 is that it jumps out of profile when left for langer time idle. I get a horrible dry hit when using it after its been idle for a couple af hours, but now I now why so I just change back to the profile I have on the attached tank, but other than that the 75 is also a great chip, but I changed some settings It came with Daniels settings, but some of them did not suit me.