XPS 13 9360 idling at 2.3-2.7W

I have a Dell XPS 13 9360, with an i7-7560U, 16GB RAM, 512GB SSD, and the QHD+ (3200x1800) display.

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I formatted my NVME drive (whatever the SK Hynix drive is) to 4K sectors and installed macOS Mojave. I'm using this Github repository for my Clover configuration.

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When I'm idling (no applications except Intel Power Gadget open), my CPU power hovers anywhere from 2.3 to 2.7W, and runs at 1-1.3Ghz. Comparing this to other XPS machines, I should be sitting at 0.5W @ 1Ghz.

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I created a CPUFriend kext and installed it in Clover, which did nothing (presumably because HWP is enabled, so the CPU is already configured).

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After doing some research, I believe that my problem may come down to lack of power management for my NVME SSD, so it runs at ~1.5W. 2.3-1.5=0.8, which should put me in the wattage range I was expecting to be in.

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Is my NVME drive likely the problem? If so, is there any way of adding power management support?

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I do have a Samsung 960 EVO 250GB in my desktop, and I suppose that I can swap the two drives around, assuming that it will have correct power management.