Hi. I have been using the subtank mini for a while now. First i had leaks when using the occ coils. I had leaks using original coils and replacement coils. Every time i thought i had solved the leaks prety soon i would find my tank leaking again. I was told to use the rba instead which solved the problem. No more leaks. Thing is after a few months with the rba i am now getting burnt hits quite often and not much flavour. I am using 26awg 0.5ohm pre built coils. I am installing the coil and wicking correctly as far as i know by watching tutorials online. I have cleaned the tank, base and rba. I vape at 15watts as any higher it gets to hot or i get burnt hits. I am thinking of giving up on the subtank mini and kbox mod. I like the look of the smok tfv4 mini and would prefere to use the pre bought coils with it not the rba. I was considering buying the mismec reuleaux rx200 with the full size tfv4 but to be honest it seems too big and powerfull for my needs. I would like something that can blow half decent clouds at home but is also small enough to take out and can be turned down so i can hide at back of cinema and vape. The eleaf pico with melo tank looks good but i am not sure of battery life and i want a top fill tank. Any advice/info much appreciated.