Are these the coil heads that you are using? http://www.vaporifics.com/aspire-cleito-120-maxi-watt-coil-0-16ohm-5pk/ They are stainless steel. Are you using them in temp mode or power mode?
You will always have 8, what you can do would be to make profiles 3 & 4 the same as 1 & 2. Do the same with 5 & 6 and 7 & 8. That way you will always have your desired change one click away, either up or down.That's about all that can be done,
Not much difference, give it some time charging/using, it should balance. Then see how it does under load. After looking at it more ...maybe, see if it continues after some cycles.
SMY had it set to 0.0016 ohm, tested it myself and got the 0.002 Presumably they also got 0.002 and subtracted 20% as was recommended way back in time on the forum.
No it's not the firmware, it's good connection between the board and 510. I'm pretty sure i'm using the same firmware that you are on my 75.......2016-06-05.sw-update
The 510 on the SMY SDNA75 I consider one of the better ones of the mass produced mods. It is my only DNA mod with a 0.002 ohm mod resistance. The others are 0.004 - 0.005 ohms There is one problem that could easily develop with it and that is they soldered the ground output wire to the nut that holds the 510 body into the case. If the nut becomes loose problems arise. It's certainly easy enough to check and correct.
That battery if authentic should be fine. Set your cell soft cut off to 2.7 volts. A bad connection from the battery will result with that warning as well as a low battery. Clean the threads anyway even if they look clean.
Clean the threads on the battery cap and it's corresponding threads, I suspect your problem is there. Also if using EScribe Device monitor you can see if you have a really big voltage drop on the battery (because of a bad connection, ect.)
Well you probably did the right thing by putting it backto the original setting. Being that it wasn't zero means they checked it at least on one. I'm going to have to call it a software flaw of sorts. I believe it came about with SP2. You could revert it back to a 2015 or January 2016 firmware to set it for your self but if there's not a problem I wouldn't bother. Most mods fall into the 0.004 - 0.006 ohm area.