Default Most stable flex rom?

Before the comments begin, I'm not asking for the best, I'm simply asking for the most stable flex rom. I am planning to root and flash a flex rom and then flash dorimanx kernel on top of it (let's undervolt a step or two ). Anybody have any experience?
The split view, the option to hide navigation bar and other small things along with undervolting makes me drool.

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Optimise the battery life of your LG G2 without root!