So, fyi, Im noticing the same, with the 2.1 firmware I dropped the temp down to 400 (down from 430) using the same eliquid I was vaping before.
When I watched PBusardo's video showing the temp variants in part 2, it looked like the device was keeping the coil about 30 degrees below the users setting when it was actually being measured externally so I think they just tweaked the formula used in the chip to make the temp more accurate.
Ive had my SX Mini M since Saturday afternoon, a quick 2 day update...
Taking the menu nonsense and the wonky bugs out of the picture, the SX Mini is my current favourite device. And I know I say this alot, there is no reason I feel like I need to switch to anything. Its got very accurate wattage mode, temp control, all in a small form factor, and contrary to others experience, in temp mode, the battery life is better than my P3.
Oh yea, this by the way is my first box mod. I hated the form factor of virtually every box mod out there, big, clunky, blech. This one is very comfortable in my hand and its about as wide as I would want to have my mod to be, if it were any wider, it would be uncomfortable.
Also, not related to the SX Mini, but Im currently using the Kanger sub tank with the rebuildable section instead of the OCC prebuilt coils and I am getting excellent flavour and my eliquid consumption is half what it was when using the OCC coils so if you're still using the OCC prebuilt coils, consider (I know its obnoxious) building a single nickel coil with 7 wraps or so and throw it on (most vape shops will even build the coil for you, then you merely need to remove the old wick, dry burn and rinse the coil, then rewick and you're just like new - most vape shops will show you how to do this and you can even go in when it needs to be rewicked and they will have you do it in front of them so you are sure you are doing it right, usually needs to be rewicked every 30-50 mil of juice you've vaped, you wont need a new coil but maybe every 6 months and the vape shop can do that for you when that needs to be done and you can rewick it yourself every time it needs to be done).
I know how to build my own coils btw, for those elitists out there, but I hate building them on tank style mods, but now that I know you can do a quick dry burn and just rewick, Im SO much happier with using my own coil, especially knowing I can do this every 6 months or so. Saves me on the cost of OCC coils (which I used as a matter of convenience) and Im using half the eliquid with the same flavour production as the OCC coils.
I LOVE my Kafun 4, I just hate the fiddly bits and the Kanger sub tank mega with its 7 mil juice capacity (contrary to the specs, the rebuildable section does not actually change the juice capacity) holds enough eliquid to vape all day, and I am a heavy user (with the OCC coils, I was vaping around 12-14 mil of juice a day).
And my vertical rebuildable on this SX Mini is bloody brilliant (and I have this particular dripper because the flavour is impeccable AND its much easier for me to build on, alot of people have trouble with this particular device and building on it, I for some reason dont have a problem with vertical coils). I dont even use temp control with my dripper, I just love this thing. Its consistent, it feels like my little vaping buddy, its there when I need it.
