Trouble Flashing Custom ROM

So I rooted my 5X with the help of the Nexus root toolkit. I have successfully flashed Elementalx kernel through TWRP and have tried flashing the ROM and GApps through the toolkit and through TWP but always end up in a bootloop at the Google screen. What am I doing wrong?

I'm just looking to load a Custom ROM to possibly squeeze some extra battery life out of my 5X.:confused:

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