Avoid ohm jumping? I actually don't have this issue... but I've gone through all the minute details of mod setup process in eScribe so it might be just that. As for the ohms going up, it goes up with use in all mods when using SS, that's just what SS does lol hence it being used for TC.
The DNA board is just a lot more anal at reading ohms so you see the jump up very, very clearly.
That said, for me the cold reading off my GMv3 isn't really the best to sustain smooth TC (probably due to my coils being a few months old), so I lock the reading at 0.4. If you have any jumping issues you can lock ohms too. It's supposedly not recommended, but it hasn't been giving me any troubles either.
As for the battery cover, get Noloax from somewhere (I think VapeBoss Taman Megah got sell some in tubes) and liberally apply to the threads to... well... keep it from locking. Also, never apply too much force screwing it in, just a bit.
If it feels like it's getting stuck, reverse out and reinsert. Proceed to screw tenderly.
*ehem*
Also, when the threads on the cover gets beyond help from repeated screwing (and no amount of Noloax is helping anymore), get a new cover.
Unfortunately, it's possible to get a "shitty" cover out of the box too (screws in tight like a virg and gets stuck no matter how tenderly you screw or how much noloax you use). In which case your only recourse is probably divor... I mean a new cover.
This is because (unlike the other type) screwing the misaligned (aka shitty) battery cover DOES NOT get easier with repeated attempts... it will only further destroy the threading.
Thankfully, so far I haven't had much issues myself, though the battery door latch is an absolute BIATCH to open for someone with no nails like me. I did put some sticky tape to help, but the tape has already gone AWOL. I probably need some stronger tape.
bro.. received my nano finally.. so far, the battery door very solid.. i in out in out few times no problem at all.. could it be Hcigar finally did some tuning on that? so far so good, no complain at all.