Your batteries are unsafe.
You need 30A Continuous Drain batteries for that mod. There are only 3 that you can safely use with it.
Sony VTC4
Orbtronic SX30
Xtar 30A
That's it. Any other battery is unsafe to use in that mod. It's designed to draw up to 25A from the battery and the batteries you are using are just 20A, and the battery you're thinking about is just a 10A. You're essentially vaping with a pipe bomb right now.