Then you need a 3 battery mod, or a 2 battery 27-- two battery mod. You cannot find a 2 battery 18650 on the market that is going to ACTUALLY supply that power. The BOARD may say it can be done, but in my opinion it's a bit of a "lie" or at least "advertising that isn't correct." You'll over stress your batteries, your mod, and you won't ACTUALLY be vaping over 200 for LONG. Maybe a few puffs Then your mod will inform you that your batteries need recharging, etc.
A dual 18650 mod cannot supply that power. If you THINK you are vaping at 200plus watts now, I'm here to inform you that you HAVEN'T been. It's kind of like redlining your car, you may not ACTUALLY have a motor powerful enough to go 200 miles per hour, even if the speedometer goes UP to 200. Etc.
Some light reading, kindly do not blow yourself up, for the sake of vapers everywhere, including you:
https://www.e-cigarette-forum.com/blogs/mooch.256958/
https://www.e-cigarette-forum.com/blog-entry/baditudes-blogs.7609/
Best of luck, buy a BETTER mod if you wish to vape that high. And, you haven't yet, not on a Smok mod I'm fairly certain. It may TELL you you are vaping that high, but you actually AREN'T. So be prepared if you do. I think you were having problems with your equipment in your first post, this MAY be the reason why.
Nothing wrong at all with high wattage vaping but safety first.
Anna