I've had the tank for about 3 weeks. I bought the tank only for the deck anyways. The prebuilt coils just leak and get way too hot too quick. I was using the prebuilt .8 ohm (reads .72 ohm) Clapton coil that came installed already on the deck. Works alright but I got sick of it spitting juice in my mouth. Now I've got a 28 gauge twisted coil at .62 ohm that I do like a lot more (no spit back). but it seems to just want to scorch the cotton above about 23 watts if I drag it for more than a couple seconds. I like around 25-30 watts and taking longer drags around .6 ohms. Like the coil that came with the tank included with my mod kit. Kanger subox mini c. I can see in the coil that came with the kanger, it's a bigger diameter and more wraps than what's in the tfv4. I don't know what voodoo is going on the inside of the kanger coil. It's an ssocc coil that's in it. I know the deck isn't very big on tfv4 but I don't know what to do to get it to stop scorching above 23 watts. Thucker wire ends up with like 2 wraps and i dont know if that is enough to get a decent vape. If it's just how it is then that's ok. I'll look out for a new tank when it's time re up on juice. It is just wicked with cheapo cotton balls. However it does better than the organic cotton strips that came with my tank. I've seen where the deck is wicked with the cotton to the bottom of the juice wells and where it is isn't. So I am a little unsure which or what is the best way to wick it? I have been using the coil calculator online but being super green when it comes to coil building, a little confused and don't wanna order unnecessary wires and things.