I don't know why Giga-Watt is not using our 100% WTT token to mine on their system.
It is possible that there are more tokens right than there are miners installed to handle all of the tokens. That is why Giga Watt has to spread the miners among all the token holders. As they build more pods and expand, and more miners are installed, then eventually 100% of the tokens will be used? Does that make sense?

I suspect that this is exactly the situation, but I'll temper that thought with the caveat of "for a given token rental rate." What I mean is that if I had a way to say, "please rent all of my tokens regardless of the token rental rate," and Giga-Watt could do that, then I suspect that 100% of my available tokens would be rented. The percentage that would not be rented would be the ones used for my L3+.