So I have the cuboid mini with an aspire k2 tank and Clapton 1.5 coils for a mtl. Vape and sometimes what I pull is satisfying while others it doesn't seem like a whole lot. I'm running it at 11 watts. I'm currently awaiting a cubis pro tank and notch coils hoping that will be my fix, I'm trying to quit smoking with this so I need a good vape, is there anything I am doing wrong or could be doing better? I'm just wondering why sometimes it pulls good and sometimes not, frustrating.
Highlighted your problem. Clapton coils are nice, but it is two wire in 1, 1 core wire wrapped and sheathed in a second thinner wire, looks like a guitar string (Clapton aka "Eric Clapton" guitar player), more wire mass = needs more power to ramp up to proper vaping temp, thus why you are hit or miss, cool wire that doesn't ramp up fast enough while you pull will not produce what is needed, fire it again while it is still cooling off ramps up further in heat, each fire the performance increases due to the wire is staying hot enough, moment it cools off back at square 1, so about 14 to 18 watts might be what you need. Another downside with a clapton in a small coil head, that wrap wire pulls liquid into its gaps and valleys, especially when hot, liquid flow dynamics, liquid flows to the hottest part, see this in soldering a copper plumbing elbow, the solder is pulled toward the hottest part and flame, this could dry out the wick quickly if the wick can't keep up, dry or drying wicking flavor nose dives. On top of the Nautilus/Nautilus Mini you could also look the Triton Mini (Aspire), Eleaf GS and GS Air tanks, Kanger Top/Sub Tank Nano, Protank 4, AeroTank (about as old as the Nautilus). Basically any tank that uses a standard single wire or standard dual wire coil will serve you better than one with a Clapton for MTL, Claptons really shine in Direct 2 Lung and at lower Ohm resistances like 0.5ohm or so.