So your DNA is stating that they are at 7.xx but are they rated for something closer to the 5.xx mark I believe. If this is the case I'd tighten down the coil(s) and the 510 pin. Also check if the spot where you thread in the atty is wet that can and will cause issues. I build my own coils and I have a little difference in ohm reading
Coldcoil 0.15
Warmcoil 0.16
Hotcoil 0.17-0.18
It's a minor increase but it's liveable now if jumping from 5.0 - 6.0 then that's a whole ohm going out of whack which could be the atty, coils, mod or all the above I've had that issue with kanthal wire but I rarely get it with stainless.