Hybrid is not using 100% CPU

[protectron]

test.vpy threw an error that it could not open the index file
https://ibb.co/TwvRBvg

I had to set --lookahead-slices=4 to enable --pmode. It should have been set at 4 anyway, not 0. Woops!
But, enabling --pmode and --pme did increase the CPU usage to fluctuate between 65-75%.
https://ibb.co/NrYYn96

Better, but still not 100%. I do not see any bottlenecks as neither CPU, GPU, memory, nor disk are saturated.

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Also, unrelated, even though I set --psy-rd=2 in Hybrid the output was 0. 
https://ibb.co/C95wHGq

I checked back and the value was not being passed into the encode settings. 
https://ibb.co/nD9kfkJ

Any value other than 2 (1.99, 2.01) was passed.
https://ibb.co/4285dD3

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Ok, something weird may be going on with my machine. Normally Handbrake runs at 100% but I just tried it again and it is now also fluctuating only between 65-75%.
So for now I will consider --pmode and --pme a solution.

--psy-rd is still an open issue though.