There is no need (in fact in some ways it's a bad idea) to lock your ohm's. You are basically telling the mod to read the coil incorrectly, which likely will lead to worse results.
Let me see if I can explain: With drop in coils, they manufacture THOUSANDS if not MILLIONS of those things. While some vendors do a pretty decent job of being NEAR their "stated" resistance, different mods will also "read" things slightly differently, so either your coil is just a hair "off" in it's resistance (the most likely explanation) every mod's board is different, and I could put a tank on three different mods and get (very small) resistance changes, depending on how accurately the mod reads the coils, how the board converts power, and etc. So inter-coil difference are not uncommon nor are inter-mod differences, using the same coil. The fact is, the accuracy may be different in many ways. If it's not a HUGE difference, well ignore it. Just let your mod do what it is designed to do, calculate the resistance and then slowly (and I do mean slow, I take "priming/wicking puffs without even firing the mod. The more you inhale, the more you start the capillary action needed to bring the eliquid up into the coil. I then increase by a few watts, and inhale, using the fire button (no vape may emerge, but that's fine, I am priming at this point, not seeking my perfect vape). I continue that UNTIL I reach a happy spot (I figure it out by going a few watts over, if I don't like the vape then, I back down). Some smok coils do well with a couple judicious pokes into the cotton with a needle, to loosen stuff.
I can't really speak to your coil life, as so many factors affect it. Juices that are sweet, dark or gunky reduce coil life. Chain vaping overheats your mod (especially in wattage mode) that can decrease coil life. Wattage, the higher you go, the more coil life suffers (and any manufacturer recommendation is just that, a recommendation. It's fine to be below it (and probably, healthier for the coil) but going above it can be a coil killer and etc.
Best of luck. Also, 3 days may seem like nothing, but really a more accurate determination is how much liquid you are vaping.
Finally, it is true that some smok coils are not very robust. If you want a tank with good coil life, the Crown Uwell original is not a bad choice, and it gets good reviews for flavor as well. There are many tanks where you MAY get better coil life, and having a backup setup (if you are serious about this) can be useful, in case something breaks. You could use it as an opportunity to try out another manufacturer, and having two mods would mean you could rotate your mods when chain vaping, increasing the life of the coil on both mods. Chain vaping can really be a destroyer of coils. Now that I have more setups, ALL my coils last longer and longer than they would even factoring in the fact that I have more setups. But rotating them allows me to keep temps lower and etc.
Best of luck, and welcome. I hope some of this was helpful.
Anna
