Yes. I basically fixed my (imaginary) brain.
It's bascially pointless to pursue higher consciousness without first detoxing your brain.

I have been thoroughly enjoy David R Hawkins Books Truth Vs Falslehood and Transcending the Levels Of Consciousness. But, the whole muscle stress test element (which is key to the calibration) seems as if it is rife with the potential of self deception and bias. How can we trust that the people being stressed tested aren’t biased? Did he stress test large groups or just him and his friends?

Maybe I would, maybe not. That all depends on what my goals and desires are.
Just because I choose chocolate ice cream over vanilla does mean one is better or worse from an objective point of fact.
Your personal desires are irrelevant when it comes to matters of Truth.
You have to stop thinking about reality personally. It's not personal. Stop trying to get anything beneficial out of existence. Have the courage to be totally selfless.
If you were totally selfless, it would not matter if you were sane or insane, alive or dead, healthy or sick, rich or poor, human or dog.
Truth is selfless.
When you are being selfish, you are being untruthful. You are falling into the illusion that one thing is better or worse than another. In Truth, there is no difference, no better, no worse. Being alive is not better than being dead. Being happy is not better than being in pain. That is Truth. But you don't want to accept it.
The ultimate freedom and joy is the realization that there is no difference between anything. This is what puts an end to struggle and suffering.
So long as you believe that one thing is better than other, you will always suffer and struggle and be unhappy.
Truth is the only salvation.